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Document and Entity Information - USD ($)	6 Months Ended
Document and Entity Information - USD ($)	Jul. 01, 2017	Jul. 28, 2017
Entity Information [Line Items]
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 01, 2017
Entity Registrant Name	VISHAY INTERTECHNOLOGY INC
Entity Central Index Key	0000103730
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float	$ 2,237,000,000
Common Stock [Member]
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		134,124,823
Class B Convertible Common Stock [Member]
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		12,129,227

Consolidated Condensed Balance Sheets - USD ($) $ in Thousands	Jul. 01, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 561,032	$ 471,781
Short-term investments	626,172	626,627
Accounts receivable, net	327,131	274,027
Inventories:
Finished goods	126,667	109,075
Work in process	175,027	162,311
Raw materials	117,100	109,859
Total inventories	418,794	381,245
Prepaid expenses and other current assets	117,055	110,792
Total current assets	2,050,184	1,864,472
Property and equipment, at cost:
Land	91,282	89,753
Buildings and improvements	586,898	570,932
Machinery and equipment	2,376,420	2,283,222
Construction in progress	58,150	71,777
Allowance for depreciation	(2,266,097)	(2,166,813)
Property, Plant and Equipment, Net, Total	846,653	848,871
Goodwill	142,209	141,407
Other intangible assets, net	76,945	84,463
Other assets	142,853	138,588
Total assets	3,258,844	3,077,801
Current liabilities:
Notes payable to banks	11	3
Trade accounts payable	181,906	174,107
Payroll and related expenses	129,836	114,576
Other accrued expenses	153,546	149,131
Income taxes	9,630	19,033
Total current liabilities	474,929	456,850
Long-term debt less current portion	350,329	357,023
Deferred income taxes	288,516	286,797
Other liabilities	65,366	59,725
Accrued pension and other postretirement costs	267,879	257,789
Total liabilities	1,447,019	1,418,184
Redeemable convertible debentures	88,044	88,659
Vishay stockholders' equity
Common stock	13,413	13,385
Class B convertible common stock	1,213	1,213
Capital in excess of par value	1,955,926	1,952,988
(Accumulated deficit) retained earnings	(232,418)	(307,417)
Accumulated other comprehensive income (loss)	(19,503)	(94,652)
Total Vishay stockholders' equity	1,718,631	1,565,517
Noncontrolling interests	5,150	5,441
Total equity	1,723,781	1,570,958
Total liabilities, temporary equity, and equity	$ 3,258,844	$ 3,077,801

Consolidated Condensed Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Consolidated Condensed Statements of Operations [Abstract]
Net revenues	$ 644,892	$ 590,051	$ 1,251,150	$ 1,160,657
Costs of products sold	471,929	443,923	917,312	877,220
Gross profit	172,963	146,128	333,838	283,437
Selling, general, and administrative expenses	90,446	92,253	185,164	182,539
Restructuring and severance costs	481	4,467	1,950	10,942
Operating income	82,036	49,408	146,724	89,956
Other income (expense):
Interest expense	(7,076)	(6,270)	(13,866)	(12,736)
Other	749	2,256	353	3,035
Gain on early extinguishment of debt	0	986	0	4,597
Loss on disposal of equity affiliate			(7,060)	0
Nonoperating Income (Expense), Total	(6,327)	(3,028)	(20,573)	(5,104)
Income before taxes	75,709	46,380	126,151	84,852
Income tax expense	19,300	13,151	32,793	23,471
Net earnings	56,409	33,229	93,358	61,381
Less: net earnings attributable to noncontrolling interests	219	143	449	281
Net earnings attributable to Vishay stockholders	$ 56,190	$ 33,086	$ 92,909	$ 61,100
Basic earnings per share attributable to Vishay stockholders	$ 0.38	$ 0.22	$ 0.63	$ 0.41
Diluted earnings per share attributable to Vishay stockholders	$ 0.36	$ 0.22	$ 0.60	$ 0.41
Weighted average shares outstanding - basic	146,381	147,643	146,328	147,739
Weighted average shares outstanding - diluted	155,300	149,845	155,088	150,237
Cash dividends per share	$ 0.0625	$ 0.0625	$ 0.1250	$ 0.1250

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Consolidated Statements of Comprehensive Income [Abstract]
Net earnings	$ 56,409	$ 33,229	$ 93,358	$ 61,381
Other comprehensive income (loss), net of tax
Pension and postretirement actuarial items	1,216	1,657	3,551	3,525
Foreign currency translation adjustment	53,523	(22,484)	70,816	10,048
Unrealized gain (loss) on available-for-sale securities	511	719	782	1,346
Other comprehensive income (loss)	55,250	(20,108)	75,149	14,919
Comprehensive income (loss)	111,659	13,121	168,507	76,300
Less: comprehensive income attributable to noncontrolling interests	219	143	449	281
Comprehensive income (loss) attributable to Vishay stockholders	$ 111,440	$ 12,978	$ 168,058	$ 76,019

Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016
Operating activities
Net earnings	$ 93,358	$ 61,381
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	80,380	79,117
(Gain) loss on disposal of property and equipment	(51)	76
Accretion of interest on convertible debentures	2,444	2,259
Inventory write-offs for obsolescence	9,729	11,225
Deferred income taxes	6,640	(2,836)
Non-cash loss on disposal of equity affiliate	7,060	0
Gain on early extinguishment of debt	0	(4,597)
Other	2,579	(9,009)
Net change in operating assets and liabilities, net of effects of businesses acquired	(73,873)	(42,203)
Net cash provided by operating activities	128,266	95,413
Investing activities
Capital expenditures	(49,067)	(51,073)
Proceeds from sale of property and equipment	1,288	193
Purchase of short-term investments	(418,114)	(274,524)
Maturity of short-term investments	454,918	351,326
Other investing activities	(6,664)	2,975
Net cash provided by (used in) investing activities	(17,639)	28,897
Financing activities
Principal payments on long-term debt and capital leases	0	(34,044)
Net proceeds (payments) on revolving credit lines	(10,000)	(66,000)
Common stock repurchase	0	(6,123)
Net changes in short-term borrowings	7	(725)
Proceeds from stock options exercised	1,260	0
Distributions to noncontrolling interests	(740)	(707)
Cash withholding taxes paid when shares withheld for vested equity awards	(1,971)	(442)
Other financing activities	(1,255)	0
Net cash provided by (used in) financing activities	(30,976)	(126,481)
Effect of exchange rate changes on cash and cash equivalents	9,600	1,831
Net increase (decrease) in cash and cash equivalents	89,251	(340)
Cash and cash equivalents at beginning of period	471,781	475,507
Cash and cash equivalents at end of period	561,032	475,167
Common Stock [Member]
Financing activities
Dividends and Interest Paid	(16,761)	(16,924)
Class B Convertible Common Stock [Member]
Financing activities
Dividends and Interest Paid	$ (1,516)	$ (1,516)

Consolidated Condensed Statement of Equity - USD ($) $ in Thousands	Common Stock	Class B Convertible Common Stock [Member]	Capital In Excess of Par Value	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Total Vishay Stockholders' Equity	Noncontrolling Interest	Total
Cumulative effect of accounting change for adoption of ASU	$ 0	$ 0	$ 0	$ 386	$ 0	$ 386	$ 0	$ 386
Balance at Dec. 31, 2016	13,385	1,213	1,952,988	(307,417)	(94,652)	1,565,517	5,441	1,570,958
Net earnings	0	0	0	92,909	0	92,909	449	93,358
Other comprehensive income (loss)	0	0	0	0	75,149	75,149	0	75,149
Distributions to noncontrolling interests	0	0	0	0	0	0	(740)	(740)
Temporary equity reclassification	0	0	615	0	0	615	0	615
Restricted stock issuances	20	0	(1,991)	0	0	(1,971)	0	(1,971)
Dividends declared	0	0	19	(18,296)	0	(18,277)	0	(18,277)
Stock compensation expense	0	0	3,043	0	0	3,043	0	3,043
Stock options exercised	8	0	1,252	0	0	1,260	0	1,260
Balance at Jul. 01, 2017	$ 13,413	$ 1,213	$ 1,955,926	$ (232,418)	$ (19,503)	$ 1,718,631	$ 5,150	$ 1,723,781

Consolidated Condensed Statement of Equity (Parenthetical)	6 Months Ended
	Jul. 01, 2017 $ / shares shares
Consolidated Condensed Statement of Equity [Abstract]
Restricted stock issuances (in shares)	200,688
Stock options exercised (in shares)	77,334
Common Stock, Dividends, Per Share, Cash Paid \| $ / shares	$ 0.1250

Basis of Presentation	6 Months Ended
Basis of Presentation	Jul. 01, 2017
Basis of Presentation [Abstract]
Basis of Presentation	Note 1 – Basis of Presentation The accompanying unaudited consolidated condensed financial statements of Vishay Intertechnology, Inc. ("Vishay" or the "Company") have been prepared in accordance with the instructions to Form 10-Q and therefore do not include all information and footnotes necessary for presentation of financial position, results of operations, and cash flows required by accounting principles generally accepted in the United States ("GAAP") for complete financial statements. The information furnished reflects all normal recurring adjustments which are, in the opinion of management, necessary for a fair summary of the financial position, results of operations, and cash flows for the interim periods presented. The financial statements should be read in conjunction with the consolidated financial statements filed with the Company's Annual Report on Form 10-K for the year ended December 31, 2016. The results of operations for the fiscal quarter and six fiscal months ended July 1, 2017 are not necessarily indicative of the results to be expected for the full year. The Company reports interim financial information for 13-week periods beginning on a Sunday and ending on a Saturday, except for the first fiscal quarter, which always begins on January 1, and the fourth fiscal quarter, which always ends on December 31. The four fiscal quarters in 2017 end on April 1, 2017, July 1, 2017, September 30, 2017, and December 31, 2017, respectively. The four fiscal quarters in 2016 ended on April 2, 2016, July 2, 2016, October 1, 2016, and December 31, 2016, respectively. Recently Adopted Accounting Guidance In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The ASU is the result of the FASB's simplification initiative intended to improve GAAP by reducing costs and complexity while maintaining or enhancing the usefulness of related financial statement information. The ASU simplifies several aspects of the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. The Company adopted the ASU on January 1, 2017. The ASU allowed prospective adoption of certain aspects, while requiring retrospective adoption of other aspects of the guidance. The Company recognized a cumulative-effect adjustment for previously unrecognized excess tax benefits in January 1, 2017 retained earnings (accumulated deficit) of $386. The Company reclassified $442 of cash withholding taxes paid when shares were withheld for vested equity awards in the accompanying consolidated condensed statement of cash flows for the six fiscal months ended July 2, 2016 to financing cash flows. The Company retrospectively reclassified excess tax benefits as operating cash flows on the consolidated condensed statement of cash flows. The Company will recognize forfeitures on its stock-based awards as they occur. Recently Issued Accounting Guidance In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The ASU is the result of a convergence project between the FASB and the International Accounting Standards Board to clarify the principles for recognizing revenue and to develop a common revenue standard for GAAP and International Financial Reporting Standards. The ASU removes inconsistencies and weaknesses in revenue requirements; provides a more robust framework for addressing revenue issues; improves comparability of revenue recognition practices across entities, industries, jurisdictions, and capital markets; provides more useful information to users of financial statements through expanded disclosure requirements; and simplifies the preparation of financial statements by reducing the number of requirements to which an entity must refer. The ASU is effective for the Company for interim and annual periods beginning on or after January 1, 2018. The Company intends to retrospectively adopt the ASU effective January 1, 2018. Based on work performed to date, the adoption of the ASU is not expected to have a material impact on the Company's results of operations. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The ASU is the result of a project between the FASB and the International Accounting Standards Board to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. Upon adoption of the ASU, the Company will recognize lease assets and liabilities for its operating leases which are not currently reported on its consolidated balance sheets. The ASU is effective for the Company for interim and annual periods beginning on or after January 1, 2019, with the ability to early adopt. The Company is currently evaluating the effect of the ASU on its lease contracts. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU replaces the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The ASU is effective for the Company for interim and annual periods beginning on or after January 1, 2020, with the ability to early adopt for interim and annual periods beginning on or after January 1, 2019. The Company is currently evaluating the effect of the ASU on its financial assets measured at amortized cost. Reclassifications In addition to the changes due to the retrospective adoption of certain aspects of new accounting guidance described above, certain prior period amounts have been reclassified to conform to the current financial statement presentation.

Restructuring and Related Activities

6 Months Ended

Jul. 01, 2017

Restructuring and Related Activities [Abstract]

Restructuring and Related Activities

Note 2 – Restructuring and Related Activities

The Company places a strong emphasis on controlling its costs and combats general price inflation by continuously improving its efficiency and operating performance. When the ongoing cost containment activities are not adequate, the Company takes actions to maintain its cost competitiveness.

The Company incurred significant restructuring costs in its past to reduce its cost structure. Historically, the Company's primary cost reduction technique was through the transfer of production from high-labor-cost countries to lower-labor-cost countries. Since 2013, the Company's cost reduction programs have primarily focused on reducing fixed costs, including selling, general, and administrative expenses.

In 2013, the Company announced various cost reduction programs. These programs were substantially implemented by the end of the first fiscal quarter of 2016, with some additional costs incurred in the remainder of 2016. Many of the severance costs were recognized ratably over the required stay periods. In November 2016, the Company announced an extension of one of these programs.

In 2015, the Company announced additional global cost reduction programs. These programs include a facility closure in the Netherlands. The cash costs of these programs, primarily severance, are expected to aggregate to approximately $30,000. Complete implementation of these programs is expected to occur before the end of 2017.

The following table summarizes restructuring and related expenses which were recognized and reported on a separate line in the accompanying consolidated condensed statements of operations:

	Fiscal quarters ended				Six fiscal months ended
	July 1, 2017		July 2, 2016		July 1, 2017		July 2, 2016
MOSFETs Enhanced Competitiveness Program	$	28	$	1,110	$	448	$	5,025
Global Cost Reduction Programs		453		3,357		1,502		5,917
Total	$	481	$	4,467	$	1,950	$	10,942

MOSFETs Enhanced Competitiveness Program

Over a period of approximately 2 years and in a series of discrete steps, the manufacture of wafers for a substantial share of products was transferred into a more cost-efficient fab. As a consequence, certain other manufacturing previously occurring in-house was transferred to third-party foundries. This transfer of production was substantially completed by the end of the first fiscal quarter of 2016.

Employees generally were required to remain with the Company during the production transfer period. Accordingly, the Company accrued these severance costs ratably over the respective employees' remaining service periods. The Company has incurred and may continue to incur other exit costs associated with the production transfer, including certain contract termination costs.

As a result of a review of the financial results and outlook for the Company's MOSFETs segment following the completion of production transfers, the Company has determined to implement further cost reductions for the MOSFETs segment.

In November 2016, the Company announced an extension of the MOSFETs Enhanced Competitiveness Program. The revised program includes various cost reduction initiatives, primarily the transfer of all remaining manufacturing operations at its Santa Clara, California facility to other Vishay facilities or third-party subcontractors. The production transfers will be completed in steps by the end of 2017. The Company expects to incur cash charges of approximately $4,000 to $8,000, primarily related to severance, to implement these steps. The total cash charges for the MOSFETs Enhanced Competitiveness Program are expected to be $24,000 to $27,000. The Company expects to maintain its R&D and management presence in the Silicon Valley area, even after the cessation of manufacturing operations there.

The following table summarizes the activity to date related to this program:

Expense recorded in 2013	$	2,328
Cash paid		(267	)
Balance at December 31, 2013	$	2,061
Expense recorded in 2014		6,025
Cash paid		(856	)
Balance at December 31, 2014	$	7,230
Expense recorded in 2015		5,367
Cash paid		(426	)
Foreign currency translation		1
Balance at December 31, 2015	$	12,172
Expense recorded in 2016		9,744
Cash paid		(15,686	)
Foreign currency translation		2
Balance at December 31, 2016	$	6,232
Expense recorded in 2017		448
Cash paid		(3,356	)
Balance at July 1, 2017	$	3,324

Severance benefits are generally paid in a lump sum at cessation of employment. Other exit costs of $80 are included in the expenses incurred in 2017 in the table above. The entire amount of the liability is considered current and is included in other accrued expenses in the accompanying consolidated condensed balance sheets.

Voluntary Separation / Retirement Program

The voluntary separation / early retirement program was offered to employees worldwide who were eligible because they met job classification, age, and years-of-service criteria as of October 31, 2013. The program benefits varied by country and job classification, but generally included a cash loyalty bonus based on years of service. All employees eligible for the program have left the Company.

These employees generally were not aligned with any particular segment. The effective separation / retirement date for most employees who accepted the offer was June 30, 2014 or earlier, with a few exceptions to allow for a transition period. The Company recorded $13,373 of expenses for this program, primarily in 2013 and 2014. Substantially all amounts related to this program have been paid as of July 1, 2017.

Global Cost Reduction Programs

The global cost reduction programs announced in 2015 include a plan to reduce selling, general, and administrative costs company-wide, and targeted streamlining and consolidation of production for certain product lines within its Capacitors and Resistors & Inductors segments.

The following table summarizes the activity to date related to this program:

Expense recorded in 2015	$	13,753
Cash paid		(986	)
Foreign currency translation		(150	)
Balance at December 31, 2015	$	12,617
Expense recorded in 2016		9,918
Cash paid		(16,237	)
Foreign currency translation		(34	)
Balance at December 31, 2016	$	6,264
Expense recorded in 2017		1,502
Cash paid		(4,728	)
Foreign currency translation		237
Balance at July 1, 2017	$	3,275

The following table summarizes the expense recognized by segment related to this program:

	Fiscal quarters ended				Six fiscal months ended
	July 1, 2017		July 2, 2016		July 1, 2017		July 2, 2016
Diodes	$	13	$	130	$	13	$	578
Optoelectronic Components		242		775		242		953
Resistors & Inductors		84		1,504		935		2,522
Capacitors		85		89		246		423
Unallocated Selling, General, and Administrative Expenses		29		859		66		1,441
Total	$	453	$	3,357	$	1,502	$	5,917

Severance benefits are generally paid in a lump sum at cessation of employment. The current portion of the liability is $2,633 and is included in other accrued expenses in the accompanying consolidated condensed balance sheets. The non-current portion of the liability is included in other liabilities in the accompanying consolidated condensed balance sheets.

Income Taxes	6 Months Ended
Income Taxes	Jul. 01, 2017
Income Taxes [Abstract]
Income Taxes	Note 3 – Income Taxes The provision for income taxes consists of provisions for federal, state, and foreign income taxes. The effective tax rates for the periods ended July 1, 2017 and July 2, 2016 reflect the Company's expected tax rate on reported income from continuing operations before income tax and tax adjustments. The Company operates in a global environment with significant operations in various jurisdictions outside the United States. Accordingly, the consolidated income tax rate is a composite rate reflecting the Company's earnings and the applicable tax rates in the various jurisdictions where the Company operates. Income tax expense for the fiscal quarter and six fiscal months ended July 1, 2017 includes $1,240 and $2,208, respectively, for the periodic remeasurement of the deferred tax liability recorded for the cash repatriation program compared to $1,217 and $1,986 for the fiscal quarter and six fiscal months ended July 2, 2016, respectively. The cash repatriation program is expected to occur over several years, and the deferred tax liability is based on the available sources of cash, applicable tax rates, and other factors and circumstances, as of each respective balance sheet date. Changes in the underlying facts and circumstances result in changes in the deferred tax liability balance, which are recorded as tax benefit or expense. During the second fiscal quarter of 2017, the Company repatriated $38,000 pursuant to this program. During the six fiscal months ended July 1, 2017, the liabilities for unrecognized tax benefits decreased by $2,225 on a net basis, due to payments and settlements, partially offset by increases for tax positions taken in the current period, interest, and foreign currency effects.

Long-Term Debt

6 Months Ended

Jul. 01, 2017

Long-Term Debt [Abstract]

Long-Term Debt

Note 4 – Long-Term Debt

Long-term debt consists of the following:

	July 1, 2017			December 31, 2016

Credit facility	$	133,000		$	143,000
Convertible senior debentures, due 2040		109,291			108,120
Convertible senior debentures, due 2041		56,072			55,442
Convertible senior debentures, due 2042		61,956			61,341
Deferred financing costs		(9,990	)		(10,880	)
		350,329			357,023
Less current portion		-			-
	$	350,329		$	357,023

Convertible Senior Debentures

Vishay currently has three issuances of convertible senior debentures outstanding with generally congruent terms. The quarterly cash dividend program of the Company results in adjustments to the conversion rate and effective conversion price for each issuance of the Company's convertible senior debentures effective as of the ex-dividend date of each cash dividend.

The following table summarizes some key facts and terms regarding the three series of outstanding convertible senior debentures following the adjustment made to the conversion rate of the debentures on the ex-dividend date of the June 29, 2017 dividend payment:

	Due 2040			Due 2041			Due 2042
Issuance date	November 9, 2010			May 13, 2011			May 31, 2012
Maturity date	November 15, 2040			May 15, 2041			June 1, 2042
Principal amount	$	275,000		$	150,000		$	150,000
Cash coupon rate (per annum)		2.25	%		2.25	%		2.25	%
Nonconvertible debt borrowing rate at issuance (per annum)		8.00	%		8.375	%		7.50	%
Conversion rate effective June 13, 2017 (per $1 principal amount)		76.6985			55.9705			90.1791
Effective conversion price effective June 13, 2017 (per share)	$	13.04		$	17.87		$	11.09
130% of the conversion price (per share)	$	16.95		$	23.23		$	14.42
Call date	November 20, 2020			May 20, 2021			June 7, 2022

Prior to three months before the maturity date, the holders may only convert their debentures under the following circumstances: (1) during any fiscal quarter after the first full quarter subsequent to issuance, if the sale price of Vishay common stock reaches 130% of the conversion price for a specified period; (2) the trading price of the debentures falls below 98% of the product of the sale price of Vishay's common stock and the conversion rate for a specified period; (3) Vishay calls any or all of the debentures for redemption, at any time prior to the close of business on the third scheduled trading day immediately preceding the redemption date; or (4) upon the occurrence of specified corporate events.

The convertible debentures due 2042 became convertible subsequent to the December 31, 2016 evaluation of the conversion criteria, remained convertible subsequent to the April 1, 2017 evaluation, and remain convertible subsequent to the July 1, 2017 evaluation, due to the sale price of Vishay's common stock exceeding 130% of the conversion price for the applicable periods in the fourth fiscal quarter of 2016 and first and second fiscal quarters of 2017. The debentures due 2042 will remain convertible until September 30, 2017, at which time the conversion criteria will be reevaluated. At the direction of its Board of Directors, the Company intends, upon future conversion of any of the convertible senior debentures, to repay the principal amounts of the convertible senior debentures in cash and settle any additional amounts in shares of Vishay common stock. The excess of the amount that the Company would pay to the holders of the debentures due 2042 upon conversion over the carrying value of the liability component of the debentures currently convertible has been reclassified as temporary equity on the consolidated condensed financial statements. The Company intends to finance the principal amount of any converted debentures using borrowings under its credit facility. Accordingly, the debt component of the convertible debentures due 2042 continues to be classified as a non-current liability on the consolidated condensed balance sheets.

GAAP requires an issuer to separately account for the liability and equity components of the instrument in a manner that reflects the issuer's nonconvertible debt borrowing rate when interest costs are recognized in subsequent periods. The resulting discount on the debt is amortized as non-cash interest expense in future periods.

The carrying values of the liability and equity components of the convertible debentures are reflected in the Company's consolidated condensed balance sheets as follows:

	Principal amount of the debentures		Unamortized discount			Embedded derivative		Carrying value of liability component		Equity component (including temporary equity) - net carrying value
July 1, 2017
Due 2040	$	275,000		(166,058	)		349	$	109,291	$	110,094
Due 2041	$	150,000		(94,221	)		293	$	56,072	$	62,246
Due 2042	$	150,000		(88,228	)		184	$	61,956	$	57,874
Total	$	575,000	$	(348,507	)	$	826	$	227,319	$	230,214

December 31, 2016
Due 2040	$	275,000		(167,273	)		393	$	108,120	$	110,094
Due 2041	$	150,000		(94,843	)		285	$	55,442	$	62,246
Due 2042	$	150,000		(88,835	)		176	$	61,341	$	57,874
Total	$	575,000	$	(350,951	)	$	854	$	224,903	$	230,214

Interest is payable on the debentures semi-annually at the cash coupon rate; however, the remaining debt discount is being amortized as additional non-cash interest expense using an effective annual interest rate equal to the Company's estimated nonconvertible debt borrowing rate at the time of issuance. In addition to ordinary interest, contingent interest will accrue in certain circumstances relating to the trading price of the debentures and under certain other circumstances beginning ten years subsequent to issuance.

Interest expense related to the debentures is reflected on the consolidated condensed statements of operations for the fiscal quarters ended:

	Contractual coupon interest		Non-cash amortization of debt discount		Non-cash amortization of deferred financing costs		Non-cash change in value of derivative liability			Total interest expense related to the debentures
July 1, 2017
Due 2040	$	1,547		613		22		(19	)	$	2,163
Due 2041	$	844		314		12		6		$	1,176
Due 2042	$	844		306		14		12		$	1,176
Total	$	3,235	$	1,233	$	48	$	(1	)	$	4,515

July 2, 2016
Due 2040	$	1,547		567		22		(41	)	$	2,095
Due 2041	$	844		289		13		(72	)	$	1,074
Due 2042	$	844		283		14		(14	)	$	1,127
Total	$	3,235	$	1,139	$	49	$	(127	)	$	4,296

Interest expense related to the debentures is reflected on the consolidated condensed statements of operations for the six fiscal months ended:

	Contractual coupon interest		Non-cash amortization of debt discount		Non-cash amortization of deferred financing costs		Non-cash change in value of derivative liability			Total interest expense related to the debentures
July 1, 2017
Due 2040	$	3,094		1,215		44		(44	)	$	4,309
Due 2041	$	1,688		622		24		8		$	2,342
Due 2042	$	1,688		607		27		8		$	2,330
Total	$	6,470	$	2,444	$	95	$	(28	)	$	8,981

July 2, 2016
Due 2040	$	3,094		1,123		44		(35	)	$	4,226
Due 2041	$	1,688		573		24		(34	)	$	2,251
Due 2042	$	1,688		563		27		(31	)	$	2,247
Total	$	6,470	$	2,259	$	95	$	(100	)	$	8,724

Other Income (Expense)	6 Months Ended
Other Income (Expense)	Jul. 01, 2017
Other Income (Expense) [Abstract]
Other Income (Expense)	Note 5 – Other Income (Expense) In March 2017, the Company sold its 50% interest in an investment accounted for using the equity method, and recorded a loss of $7,060. The recorded loss includes Vishay's proportionate share of the investee's accumulated other comprehensive loss of $1,110, recognized upon discontinuation of the equity investment. The loss on disposal is not deductible for income tax purposes. There are certain contingencies pending resolution related to the investee, which may require adjustment to the amount of the recognized loss. The resolution of such additional contingencies is not expected to be material to the financial condition, results of operations, or cash flows of the Company.

Accumulated Other Comprehensive Income (Loss)

6 Months Ended

Jul. 01, 2017

Accumulated Other Comprehensive Income (Loss) [Abstract]

Accumulated Other Comprehensive Income (Loss)

Note 6 – Accumulated Other Comprehensive Income (Loss)

The cumulative balance of each component of other comprehensive income (loss) and the income tax effects allocated to each component are as follows:

	Pension and other post-retirement actuarial items			Currency translation adjustment			Unrealized gain (loss) on available-for-sale securities			Total
Balance at January 1, 2017	$	(64,496	)	$	(31,266	)		1,110		$	(94,652	)
Other comprehensive income before reclassifications		-			70,816			1,204		$	72,020
Tax effect		-			-			(422	)	$	(422	)
Other comprehensive income before reclassifications, net of tax		-			70,816			782		$	71,598
Amounts reclassified out of AOCI		5,072			-			-		$	5,072
Tax effect		(1,521	)		-			-		$	(1,521	)
Amounts reclassified out of AOCI, net of tax		3,551			-			-		$	3,551
Net other comprehensive income	$	3,551		$	70,816		$	782		$	75,149
Balance at July 1, 2017	$	(60,945	)	$	39,550		$	1,892		$	(19,503	)

Reclassifications of pension and other post-retirement actuarial items out of AOCI are included in the computation of net periodic benefit cost. (See Note 7 for further information).

Other comprehensive income (loss) includes Vishay's proportionate share of other comprehensive income (loss) of nonconsolidated subsidiaries accounted for under the equity method.

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

+ Details

Pensions and Other Postretirement Benefits

6 Months Ended

Jul. 01, 2017

Pensions and Other Postretirement Benefits [Abstract]

Pensions and Other Postretirement Benefits

Note 7 – Pensions and Other Postretirement Benefits

The Company maintains various retirement benefit plans.

Defined Benefit Pension Plans

The following table shows the components of the net periodic pension cost for the second fiscal quarters of 2017 and 2016 for the Company's defined benefit pension plans:

	Fiscal quarter ended July 1, 2017					Fiscal quarter ended July 2, 2016
	U.S. Plans		Non-U.S. Plans			U.S. Plans			Non-U.S. Plans

Net service cost	$	-	$	925		$	-		$	791
Interest cost		411		1,199			2,889			1,383
Expected return on plan assets		-		(518	)		(2,826	)		(542	)
Amortization of prior service cost		36		18			36			13
Amortization of losses		83		1,523			1,651			1,201
Curtailment and settlement losses		-		330			-			201
Net periodic benefit cost	$	530	$	3,477		$	1,750		$	3,047

The following table shows the components of the net periodic pension cost for the six fiscal months ended July 1, 2017 and July 2, 2016 for the Company's defined benefit pension plans:

	Six fiscal months ended July 1, 2017					Six fiscal months ended July 2, 2016
	U.S. Plans		Non-U.S. Plans			U.S. Plans			Non-U.S. Plans

Net service cost	$	-	$	1,828		$	-		$	1,565
Interest cost		821		2,366			5,889			2,736
Expected return on plan assets		-		(1,024	)		(5,651	)		(1,076	)
Amortization of prior service cost		72		36			72			25
Amortization of losses		165		3,001			3,301			2,372
Curtailment and settlement losses		-		652			-			396
Net periodic benefit cost	$	1,058	$	6,859		$	3,611		$	6,018

Net periodic benefit cost in 2017 was significantly impacted by the termination and settlement of the Company's qualified U.S. pension plan in December 2016. The settlement resulted in the immediate recognition of previously unrecognized actuarial items related to the plan in 2016 that were recorded in accumulated other comprehensive income and were being amortized into net periodic pension cost. A final reconciliation of participant data subject to the settlement annuity contract was completed during the second fiscal quarter of 2017. The final annuity pricing adjustment and related items did not have a material impact on the Company's financial results.

The Company contributed $4,409 to the Company's Taiwanese pension plans to improve the funded status of those plans in 2017.

Other Postretirement Benefits

The following table shows the components of the net periodic benefit cost for the second fiscal quarters of 2017 and 2016 for the Company's other postretirement benefit plans:

	Fiscal quarter ended July 1, 2017					Fiscal quarter ended July 2, 2016
	U.S. Plans			Non-U.S. Plans		U.S. Plans			Non-U.S. Plans

Service cost	$	33		$	67	$	32		$	68
Interest cost		78			26		85			36
Amortization of prior service (credit)		(209	)		-		(209	)		-
Amortization of losses (gains)		(23	)		15		(7	)		17
Net periodic benefit cost	$	(121	)	$	108	$	(99	)	$	121

The following table shows the components of the net periodic pension cost for the six fiscal months ended July 1, 2017 and July 2, 2016 for the Company's other postretirement benefit plans:

	Six fiscal months ended July 1, 2017					Six fiscal months ended July 2, 2016
	U.S. Plans			Non-U.S. Plans		U.S. Plans			Non-U.S. Plans

Service cost	$	66		$	131	$	63		$	135
Interest cost		155			50		170			72
Amortization of prior service (credit)		(418	)		-		(418	)		-
Amortization of losses (gains)		(46	)		29		(15	)		34
Net periodic benefit cost	$	(243	)	$	210	$	(200	)	$	241

Stock-Based Compensation

6 Months Ended

Jul. 01, 2017

Stock-Based Compensation [Abstract]

Stock-Based Compensation

Note 8 – Stock-Based Compensation

The Company has various stockholder-approved programs which allow for the grant of stock-based compensation to officers, employees, and non-employee directors of the Company.

The amount of compensation cost related to stock-based payment transactions is measured based on the grant-date fair value of the equity instruments issued. The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing model. The Company determines compensation cost for restricted stock units ("RSUs"), phantom stock units, and restricted stock based on the grant-date fair value of the underlying common stock adjusted for expected dividends paid over the required vesting period for non-participating awards. Compensation cost is recognized over the period that an officer, employee, or non-employee director provides service in exchange for the award.

The following table summarizes stock-based compensation expense recognized:

	Fiscal quarters ended				Six fiscal months ended
	July 1, 2017		July 2, 2016		July 1, 2017		July 2, 2016

Restricted stock units	$	676	$	1,085	$	2,880		2,169
Phantom stock units		-		-		163		117
Stock options		-		-		-		-
Total	$	676	$	1,085	$	3,043		2,286

The Company recognizes compensation cost for RSUs that are expected to vest and records cumulative adjustments in the period that the expectation changes.

The following table summarizes unrecognized compensation cost and the weighted average remaining amortization periods at July 1, 2017 (amortization periods in years):

	Unrecognized Compensation Cost		Weighted Average Remaining Amortization Periods

Restricted stock units	$	4,251		1.5
Phantom stock units		-		0.0
Stock options		-		0.0
Total	$	4,251

The Company currently expects all performance-based RSUs to vest and all of the associated unrecognized compensation cost for performance-based RSUs presented in the table above to be recognized.

2007 Stock Incentive Plan

The Company's 2007 Stock Incentive Program (the "2007 Program"), as amended and restated, permits the grant of up to 6,500,000 shares of restricted stock, unrestricted stock, RSUs, stock options, and phantom stock units, to officers, employees, and non-employee directors of the Company. Such instruments are available for grant until May 20, 2024.

Restricted Stock Units

RSU activity under the 2007 Program as of July 1, 2017 and changes during the six fiscal months then ended are presented below (number of RSUs in thousands):

	Number of RSUs			Weighted Average Grant-date Fair Value per Unit
Outstanding:
January 1, 2017		1,004		$	12.74
Granted		304			15.52
Vested*		(322	)		13.54
Cancelled or forfeited		-			-
Outstanding at July 1, 2017		986		$	13.34

Expected to vest at July 1, 2017		986

* The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy the statutory tax withholding requirements.

The number of performance-based RSUs that are scheduled to vest increases ratably based on the achievement of defined performance criteria between the established target and maximum levels. RSUs with performance-based vesting criteria are expected to vest as follows (number of RSUs in thousands):

Vesting Date	Expected to Vest		Not Expected to Vest		Total
January 1, 2018		202		-		202
January 1, 2019		213		-		213
January 1, 2020		167		-		167

Phantom Stock Units

The 2007 Program authorizes the grant of phantom stock units to the extent provided for in the Company's employment agreements with certain executives. Each phantom stock unit entitles the recipient to receive a share of common stock at the individual's termination of employment or any other future date specified in the applicable employment agreement. Phantom stock units participate in dividend distribution on the same basis as the Company's common stock and Class B common stock. Dividend equivalents are issued in the form of additional units of phantom stock. The phantom stock units are fully vested at all times.

Phantom stock unit activity under the phantom stock plan as of July 1, 2017 and changes during the six fiscal months then ended are presented below (number of phantom stock units in thousands):

	Number of units		Grant-date Fair Value per Unit
Outstanding:
January 1, 2017		145
Granted		10	$	16.25
Dividend equivalents issued		1
Outstanding at July 1, 2017		156

Stock Options

In addition to stock options outstanding pursuant to the 2007 Program, during the periods presented, the Company had stock options outstanding under previous stockholder-approved stock option programs. These programs are more fully described in Note 12 to the Company's consolidated financial statements included in its Annual Report on Form 10-K for the year ended December 31, 2016. No additional options may be granted pursuant to these programs.

At December 31, 2016, there were approximately 77,000 options outstanding with a weighted average exercise price of $16.29. During the six fiscal months ended July 1, 2017, the remaining approximately 77,000 options were exercised. The total intrinsic value of options exercised during the six fiscal months ended July 1, 2017 was $20.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References + Details

Segment Information

6 Months Ended

Jul. 01, 2017

Segment Information [Abstract]

Segment Information

Note 9 – Segment Information

Vishay is a global manufacturer and supplier of electronic components. Vishay operates, and its chief operating decision maker makes strategic and operating decisions with regards to assessing performance and allocating resources based on, five reporting segments: MOSFETs, Diodes, Optoelectronic Components, Resistors & Inductors, and Capacitors. These segments represent groupings of product lines based on their functionality:

●		Metal oxide semiconductor field-effect transistors ("MOSFETs") function as solid-state switches to control power.
●		Diodes route, regulate, and block radio frequency, analog, and power signals; protect systems from surges or electrostatic discharge damage; or provide electromagnetic interference filtering.
●		Optoelectronic components emit light, detect light, or do both.
●		Resistors and inductors both impede electric current. Resistors are basic components used in all forms of electronic circuitry to adjust and regulate levels of voltage and current. Inductors use an internal magnetic field to change alternating current phase and resist alternating current.
●		Capacitors store energy and discharge it when needed.

Vishay's reporting segments generate substantially all of their revenue from product sales to the industrial, automotive, telecommunications, computing, consumer products, power supplies, military and aerospace, and medical end markets. A small portion of revenues is from royalties.

The Company evaluates business segment performance on operating income, exclusive of certain items ("segment operating income"). Only dedicated, direct selling, general, and administrative expenses of the segments are included in the calculation of segment operating income. The Company's calculation of segment operating income excludes such selling, general, and administrative costs as global operations, sales and marketing, information systems, finance and administration groups, as well as restructuring and severance costs, goodwill and long-lived asset impairment charges, and other items. Management believes that evaluating segment performance excluding such items is meaningful because it provides insight with respect to intrinsic operating results of the Company. These items represent reconciling items between segment operating income and consolidated operating income. Business segment assets are the owned or allocated assets used by each business.

The Company also regularly evaluates gross profit by segment to assist in the analysis of consolidated gross profit. The Company considers segment operating income to be the more important metric because it more fully captures the business operations of the segments.

The following tables set forth business segment information:

	MOSFETs		Diodes		Optoelectronic Components		Resistors & Inductors		Capacitors		Total
Fiscal quarter ended July 1, 2017:
Product Sales	$	114,035	$	155,717	$	73,838	$	209,146	$	92,120	$	644,856
Royalty Revenues		-		-		-		36		-	$	36
Total Revenue	$	114,035	$	155,717	$	73,838	$	209,182	$	92,120	$	644,892

Gross Profit	$	25,315	$	41,130	$	25,466	$	62,090	$	18,962	$	172,963

Segment Operating Income	$	16,637	$	36,176	$	21,474	$	54,688	$	14,128	$	143,103

Fiscal quarter ended July 2, 2016:
Product Sales	$	102,219	$	142,118	$	68,059	$	192,717	$	84,856	$	589,969
Royalty Revenues		-		-		-		82		-	$	82
Total Revenue	$	102,219	$	142,118	$	68,059	$	192,799	$	84,856	$	590,051

Gross Profit	$	11,884	$	37,258	$	21,618	$	57,256	$	18,112	$	146,128

Segment Operating Income	$	2,560	$	31,550	$	15,844	$	48,571	$	12,632	$	111,157

Six fiscal months ended July 1, 2017:
Product Sales	$	219,564	$	300,612	$	139,520	$	409,523	$	181,889	$	1,251,108
Royalty Revenues		-		-		-		42		-	$	42
Total Revenue	$	219,564	$	300,612	$	139,520	$	409,565	$	181,889	$	1,251,150

Gross Profit	$	45,991	$	78,659	$	47,767	$	123,260	$	38,161	$	333,838

Segment Operating Income	$	28,398	$	68,915	$	38,389	$	108,585	$	28,300	$	272,587

Six fiscal months ended July 2, 2016:
Product Sales	$	203,152	$	277,502	$	130,834	$	376,133	$	172,876	$	1,160,497
Royalty Revenues		-		-		-		160		-	$	160
Total Revenue	$	203,152	$	277,502	$	130,834	$	376,293	$	172,876	$	1,160,657

Gross Profit	$	24,471	$	69,920	$	40,799	$	113,040	$	35,207	$	283,437

Segment Operating Income	$	5,178	$	58,193	$	29,498	$	95,454	$	23,935	$	212,258

	Fiscal quarters ended						Six fiscal months ended
	July 1, 2017			July 2, 2016			July 1, 2017			July 2, 2016
Reconciliation:
Segment Operating Income	$	143,103		$	111,157		$	272,587		$	212,258
Restructuring and Severance Costs		(481	)		(4,467	)		(1,950	)		(10,942	)
Unallocated Selling, General, and Administrative Expenses		(60,586	)		(57,282	)		(123,913	)		(111,360	)
Consolidated Operating Income	$	82,036		$	49,408		$	146,724		$	89,956
Unallocated Other Income (Expense)		(6,327	)		(3,028	)		(20,573	)		(5,104	)
Consolidated Income (Loss) Before Taxes	$	75,709		$	46,380		$	126,151		$	84,852

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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+ Details

Earnings Per Share

6 Months Ended

Jul. 01, 2017

Earnings Per Share [Abstract]

Earnings Per Share

Note 10 – Earnings Per Share

The following table sets forth the computation of basic and diluted earnings (loss) per share attributable to Vishay stockholders (shares in thousands):

	Fiscal quarters ended				Six fiscal months ended
	July 1, 2017		July 2, 2016		July 1, 2017		July 2, 2016

Numerator:
Numerator for basic earnings per share:
Net earnings attributable to Vishay stockholders	$	56,190	$	33,086	$	92,909	$	61,100

Interest savings assuming conversion of dilutive exchangeable notes, net of tax		-		-		-		38

Numerator for diluted earnings per share:
Net earnings attributable to Vishay stockholders - diluted	$	56,190	$	33,086	$	92,909	$	61,138

Denominator:
Denominator for basic earnings per share:
Weighted average shares		146,226		147,500		146,173		147,597
Outstanding phantom stock units		155		143		155		142
Adjusted weighted average shares		146,381		147,643		146,328		147,739

Effect of dilutive securities:
Convertible and exchangeable debt instruments		8,651		1,995		8,500		2,311
Restricted stock units		268		207		260		187
Dilutive potential common shares		8,919		2,202		8,760		2,498

Denominator for diluted earnings per share:
Adjusted weighted average shares - diluted		155,300		149,845		155,088		150,237

Basic earnings per share attributable to Vishay stockholders	$	0.38	$	0.22	$	0.63	$	0.41

Diluted earnings per share attributable to Vishay stockholders	$	0.36	$	0.22	$	0.60	$	0.41

Diluted earnings (loss) per share for the periods presented do not reflect the following weighted average potential common shares that would have an antidilutive effect or have unsatisfied performance conditions (in thousands):

	Fiscal quarters ended				Six fiscal months ended
	July 1, 2017		July 2, 2016		July 1, 2017		July 2, 2016
Convertible notes:
Convertible Senior Debentures, due 2040		-		20,675		-		20,625
Convertible Senior Debentures, due 2041		8,371		8,230		8,356		8,209
Weighted average employee stock options		-		105		-		105
Weighted average other		581		610		581		610

In periods in which they are dilutive, if the potential common shares related to the exchangeable notes are included in the computation, the related interest savings, net of tax, assuming conversion/exchange is added to the net earnings used to compute earnings per share.

The Company's convertible debt instruments are only convertible for specified periods upon the occurrence of certain events. The convertible debentures due 2042 became convertible subsequent to the December 31, 2016 evaluation of the conversion criteria, remained convertible subsequent to the April 1, 2017 evaluation, and remain convertible subsequent to the July 1, 2017 evaluation. In periods that the debentures are not convertible, the certain conditions which could trigger conversion of the remaining debentures have been deemed to be non-substantive, and accordingly, the Company assumes the conversion of these instruments in its diluted earnings per share computation during periods in which they are dilutive.

At the direction of its Board of Directors, the Company intends, upon conversion, to repay the principal amounts of the convertible senior debentures, due 2040, due 2041, and due 2042, in cash and settle any additional amounts in shares of Vishay common stock. Accordingly, the debentures are included in the diluted earnings per share computation using the "treasury stock method" (similar to options and warrants) rather than the "if converted method" otherwise required for convertible debt. Under the "treasury stock method," Vishay calculates the number of shares issuable under the terms of the debentures based on the average market price of Vishay common stock during the period, and that number is included in the total diluted shares figure for the period. If the average market price is less than $13.04, no shares are included in the diluted earnings per share computation for the convertible senior debentures due 2040, if the average market price is less than $17.87, no shares are included in the diluted earnings per share computation for the convertible senior debentures due 2041, and if the average market price is less than $11.09, no shares are included in the diluted earnings per share computation for the convertible senior debentures due 2042.

Fair Value Measurements

6 Months Ended

Jul. 01, 2017

Fair Value Measurements [Abstract]

Fair Value Measurements

Note 11 – Fair Value Measurements

The fair value measurement accounting guidance establishes a valuation hierarchy of the inputs used to measure fair value. This hierarchy prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. The following is a brief description of those three levels:

Level 1: Observable inputs such as quoted prices (unadjusted) in active markets for identical assets or liabilities.

Level 2: Inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active.

Level 3: Unobservable inputs that reflect the Company's own assumptions.

An asset or liability's classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. There have been no changes in the classification of any financial instruments within the fair value hierarchy in the periods presented.

The following table provides the financial assets and liabilities carried at fair value measured on a recurring basis:

	Total Fair Value			Level 1		Level 2		Level 3
July 1, 2017
Assets:
Assets held in rabbi trusts	$	43,502		$	27,940	$	15,562	$	-
Available for sale securities	$	4,335			4,335		-		-
	$	47,837		$	32,275	$	15,562	$	-
Liabilities:
Embedded derivative - convertible debentures due 2040	$	(349	)	$	-	$	-	$	(349	)
Embedded derivative - convertible debentures due 2041	$	(293	)		-		-		(293	)
Embedded derivative - convertible debentures due 2042	$	(184	)		-		-		(184	)
	$	(826	)	$	-	$	-	$	(826	)
December 31, 2016
Assets:
Assets held in rabbi trusts	$	41,917		$	27,297		14,620	$	-
Available for sale securities	$	3,969			3,969		-		-
	$	45,886		$	31,266	$	14,620	$	-
Liabilities:
Embedded derivative - convertible debentures due 2040	$	(393	)	$	-	$	-	$	(393	)
Embedded derivative - convertible debentures due 2041	$	(285	)		-		-		(285	)
Embedded derivative - convertible debentures due 2042	$	(176	)		-		-		(176	)
	$	(854	)	$	-	$	-	$	(854	)

The Company maintains non-qualified trusts, referred to as "rabbi" trusts, to fund payments under deferred compensation and non-qualified pension plans. Rabbi trust assets consist primarily of marketable securities, classified as available-for-sale and company-owned life insurance assets. The marketable securities held in the rabbi trusts are valued using quoted market prices on the last business day of the period. The company-owned life insurance assets are valued in consultation with the Company's insurance brokers using the value of underlying assets of the insurance contracts. The fair value measurement of the marketable securities held in the rabbi trust is considered a Level 1 measurement and the measurement of the company-owned life insurance assets is considered a Level 2 measurement within the fair value hierarchy.

The Company holds available for sale investments in debt securities that are intended to fund a portion of its pension and other postretirement benefit obligations outside of the United States. The investments are valued based on quoted market prices on the last business day of the year. The fair value measurement of the investments is considered a Level 1 measurement within the fair value hierarchy.

The convertible senior debentures, due 2040, due 2041, and due 2042, issued by the Company on November 9, 2010, May 13, 2011, and May 31, 2012, respectively, contain embedded derivative features that GAAP requires to be bifurcated and remeasured each reporting period. Each quarter, the change in the fair value of the embedded derivative features, if any, is recorded in the consolidated condensed statements of operations. The Company uses a derivative valuation model to derive the value of the embedded derivative features. Key inputs into this valuation model are the Company's current stock price, risk-free interest rates, the stock dividend yield, the stock volatility, and the debentures' credit spread over LIBOR. The first three aforementioned inputs are based on observable market data and are considered Level 2 inputs while the last two aforementioned inputs are unobservable and thus require management's judgment and are considered Level 3 inputs. The fair value measurement is considered a Level 3 measurement within the fair value hierarchy.

The Company enters into forward contracts with highly-rated financial institutions to mitigate the foreign currency risk associated with intercompany loans denominated in a currency other than the legal entity's functional currency. The notional amount of the forward contracts was $105,644 and $100,000 as of July 1, 2017 and December 31, 2016, respectively. The forward contracts are short-term in nature and are expected to be renewed at the Company's discretion until the intercompany loans are repaid. We have not designated the forward contracts as hedges for accounting purposes, and as such the change in the fair value of the contracts is recognized in the consolidated condensed statements of operations as a component of other income (expense). The Company estimates the fair value of the forward contracts based on applicable and commonly used pricing models using current market information and is considered a Level 2 measurement within the fair value hierarchy. The value of the forward contracts was immaterial as of July 1, 2017. The Company does not utilize derivatives or other financial instruments for trading or other speculative purposes.

The fair value of the long-term debt, excluding the derivative liabilities and deferred financing costs, at July 1, 2017 and December 31, 2016 is approximately $873,500 and $860,600, respectively, compared to its carrying value, excluding the derivative liabilities and deferred financing costs, of $359,493 and $367,049, respectively. The Company estimates the fair value of its long-term debt using a combination of quoted market prices for similar financing arrangements and expected future payments discounted at risk-adjusted rates, which are considered Level 2 inputs.

At July 1, 2017 and December 31, 2016, the Company's short-term investments were comprised of time deposits with financial institutions that have maturities that exceed 90 days from the date of acquisition; however they all mature within one year from the respective balance sheet dates. The Company's short-term investments are accounted for as held-to-maturity debt instruments, at amortized cost, which approximates their fair value. The investments are funded with excess cash not expected to be needed for operations prior to maturity; therefore, the Company believes it has the intent and ability to hold the short-term investments until maturity. At each reporting date, the Company performs an evaluation to determine if any unrealized losses are other-than-temporary. No other-than-temporary impairments have been recognized on these securities, and there are no unrecognized holding gains or losses for these securities during the periods presented. There have been no transfers to or from the held-to-maturity classification. All decreases in the account balance are due to returns of principal at the securities' maturity dates. Interest on the securities is recognized as interest income when earned.

At July 1, 2017 and December 31, 2016, the Company's cash and cash equivalents were comprised of demand deposits, time deposits with maturities of three months or less when purchased, and money market funds. The Company estimates the fair value of its cash, cash equivalents, and short-term investments using level 2 inputs. Based on the current interest rates for similar investments with comparable credit risk and time to maturity, the fair value of the Company's cash, cash equivalents, and held-to-maturity short-term investments approximate the carrying amounts reported in the consolidated condensed balance sheets.

The Company's financial instruments also include accounts receivable, short-term notes payable, and accounts payable. The carrying amounts for these financial instruments reported in the consolidated condensed balance sheets approximate their fair values.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Basis of Presentation (Policies)	6 Months Ended
Basis of Presentation (Policies)	Jul. 01, 2017
Basis of Presentation [Abstract]
Fiscal Period, Policy	The Company reports interim financial information for 13-week periods beginning on a Sunday and ending on a Saturday, except for the first fiscal quarter, which always begins on January 1, and the fourth fiscal quarter, which always ends on December 31. The four fiscal quarters in 2017 end on April 1, 2017, July 1, 2017, September 30, 2017, and December 31, 2017, respectively. The four fiscal quarters in 2016 ended on April 2, 2016, July 2, 2016, October 1, 2016, and December 31, 2016, respectively.
Description of New Accounting Pronouncements Not yet Adopted [Text Block]	Recently Issued Accounting Guidance In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The ASU is the result of a convergence project between the FASB and the International Accounting Standards Board to clarify the principles for recognizing revenue and to develop a common revenue standard for GAAP and International Financial Reporting Standards. The ASU removes inconsistencies and weaknesses in revenue requirements; provides a more robust framework for addressing revenue issues; improves comparability of revenue recognition practices across entities, industries, jurisdictions, and capital markets; provides more useful information to users of financial statements through expanded disclosure requirements; and simplifies the preparation of financial statements by reducing the number of requirements to which an entity must refer. The ASU is effective for the Company for interim and annual periods beginning on or after January 1, 2018. The Company intends to retrospectively adopt the ASU effective January 1, 2018. Based on work performed to date, the adoption of the ASU is not expected to have a material impact on the Company's results of operations. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The ASU is the result of a project between the FASB and the International Accounting Standards Board to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. Upon adoption of the ASU, the Company will recognize lease assets and liabilities for its operating leases which are not currently reported on its consolidated balance sheets. The ASU is effective for the Company for interim and annual periods beginning on or after January 1, 2019, with the ability to early adopt. The Company is currently evaluating the effect of the ASU on its lease contracts. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU replaces the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The ASU is effective for the Company for interim and annual periods beginning on or after January 1, 2020, with the ability to early adopt for interim and annual periods beginning on or after January 1, 2019. The Company is currently evaluating the effect of the ASU on its financial assets measured at amortized cost.
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	Recently Adopted Accounting Guidance In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The ASU is the result of the FASB's simplification initiative intended to improve GAAP by reducing costs and complexity while maintaining or enhancing the usefulness of related financial statement information. The ASU simplifies several aspects of the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. The Company adopted the ASU on January 1, 2017. The ASU allowed prospective adoption of certain aspects, while requiring retrospective adoption of other aspects of the guidance. The Company recognized a cumulative-effect adjustment for previously unrecognized excess tax benefits in January 1, 2017 retained earnings (accumulated deficit) of $386. The Company reclassified $442 of cash withholding taxes paid when shares were withheld for vested equity awards in the accompanying consolidated condensed statement of cash flows for the six fiscal months ended July 2, 2016 to financing cash flows. The Company retrospectively reclassified excess tax benefits as operating cash flows on the consolidated condensed statement of cash flows. The Company will recognize forfeitures on its stock-based awards as they occur.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=66092750

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01.(b)(6))
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accounting Change
-URI http://asc.fasb.org/extlink&oid=6503790

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305

+ Details

Income Taxes (Policies)	6 Months Ended
Income Taxes (Policies)	Jul. 01, 2017
Income Taxes [Abstract]
Effective Income tax Rate Description	The provision for income taxes consists of provisions for federal, state, and foreign income taxes. The effective tax rates for the periods ended July 1, 2017 and July 2, 2016 reflect the Company's expected tax rate on reported income from continuing operations before income tax and tax adjustments. The Company operates in a global environment with significant operations in various jurisdictions outside the United States. Accordingly, the consolidated income tax rate is a composite rate reflecting the Company's earnings and the applicable tax rates in the various jurisdictions where the Company operates.

Stock-Based Compensation (Policies)	6 Months Ended
Stock-Based Compensation (Policies)	Jul. 01, 2017
Stock-Based Compensation [Abstract]
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	The amount of compensation cost related to stock-based payment transactions is measured based on the grant-date fair value of the equity instruments issued. The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing model. The Company determines compensation cost for restricted stock units ("RSUs"), phantom stock units, and restricted stock based on the grant-date fair value of the underlying common stock adjusted for expected dividends paid over the required vesting period for non-participating awards. Compensation cost is recognized over the period that an officer, employee, or non-employee director provides service in exchange for the award.

Segment Information (Policies)

6 Months Ended

Jul. 01, 2017

Segment Information [Abstract]

Segment Reporting, Policy [Policy Text Block]

●		Metal oxide semiconductor field-effect transistors ("MOSFETs") function as solid-state switches to control power.
●		Diodes route, regulate, and block radio frequency, analog, and power signals; protect systems from surges or electrostatic discharge damage; or provide electromagnetic interference filtering.
●		Optoelectronic components emit light, detect light, or do both.
●		Resistors and inductors both impede electric current. Resistors are basic components used in all forms of electronic circuitry to adjust and regulate levels of voltage and current. Inductors use an internal magnetic field to change alternating current phase and resist alternating current.
●		Capacitors store energy and discharge it when needed.

Earnings Per Share (Policies)	6 Months Ended
Earnings Per Share (Policies)	Jul. 01, 2017
Earnings Per Share [Abstract]
Discussion on convertible debt included in computation of earnings per share diluted	The Company's convertible debt instruments are only convertible for specified periods upon the occurrence of certain events. The convertible debentures due 2042 became convertible subsequent to the December 31, 2016 evaluation of the conversion criteria, remained convertible subsequent to the April 1, 2017 evaluation, and remain convertible subsequent to the July 1, 2017 evaluation. In periods that the debentures are not convertible, the certain conditions which could trigger conversion of the remaining debentures have been deemed to be non-substantive, and accordingly, the Company assumes the conversion of these instruments in its diluted earnings per share computation during periods in which they are dilutive. At the direction of its Board of Directors, the Company intends, upon conversion, to repay the principal amounts of the convertible senior debentures, due 2040, due 2041, and due 2042, in cash and settle any additional amounts in shares of Vishay common stock. Accordingly, the debentures are included in the diluted earnings per share computation using the "treasury stock method" (similar to options and warrants) rather than the "if converted method" otherwise required for convertible debt. Under the "treasury stock method," Vishay calculates the number of shares issuable under the terms of the debentures based on the average market price of Vishay common stock during the period, and that number is included in the total diluted shares figure for the period. If the average market price is less than $13.04, no shares are included in the diluted earnings per share computation for the convertible senior debentures due 2040, if the average market price is less than $17.87, no shares are included in the diluted earnings per share computation for the convertible senior debentures due 2041, and if the average market price is less than $11.09, no shares are included in the diluted earnings per share computation for the convertible senior debentures due 2042.

Fair Value Measurements (Policies)	6 Months Ended
Fair Value Measurements (Policies)	Jul. 01, 2017
Fair Value Measurements [Abstract]
Fair Value of Financial Instruments, Policy	The fair value measurement accounting guidance establishes a valuation hierarchy of the inputs used to measure fair value. This hierarchy prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. The following is a brief description of those three levels: Level 1: Observable inputs such as quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2: Inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active. Level 3: Unobservable inputs that reflect the Company's own assumptions. An asset or liability's classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. There have been no changes in the classification of any financial instruments within the fair value hierarchy in the periods presented.

Restructuring and Related Activities (Tables)

6 Months Ended

Jul. 01, 2017

Restructuring and Related Activities [Abstract]

Restructuring and Related Expenses

The following table summarizes restructuring and related expenses which were recognized and reported on a separate line in the accompanying consolidated condensed statements of operations:

	Fiscal quarters ended				Six fiscal months ended
	July 1, 2017		July 2, 2016		July 1, 2017		July 2, 2016
MOSFETs Enhanced Competitiveness Program	$	28	$	1,110	$	448	$	5,025
Global Cost Reduction Programs		453		3,357		1,502		5,917
Total	$	481	$	4,467	$	1,950	$	10,942

Global Cost Reduction Program [Member]

Restructuring Cost and Reserve [Line Items]

Restructuring expenses by segment [Table Text Block]

The following table summarizes the expense recognized by segment related to this program:

	Fiscal quarters ended				Six fiscal months ended
	July 1, 2017		July 2, 2016		July 1, 2017		July 2, 2016
Diodes	$	13	$	130	$	13	$	578
Optoelectronic Components		242		775		242		953
Resistors & Inductors		84		1,504		935		2,522
Capacitors		85		89		246		423
Unallocated Selling, General, and Administrative Expenses		29		859		66		1,441
Total	$	453	$	3,357	$	1,502	$	5,917

Schedule of Restructuring Reserve by Type of Cost [Table Text Block]

The following table summarizes the activity to date related to this program:

Expense recorded in 2015	$	13,753
Cash paid		(986	)
Foreign currency translation		(150	)
Balance at December 31, 2015	$	12,617
Expense recorded in 2016		9,918
Cash paid		(16,237	)
Foreign currency translation		(34	)
Balance at December 31, 2016	$	6,264
Expense recorded in 2017		1,502
Cash paid		(4,728	)
Foreign currency translation		237
Balance at July 1, 2017	$	3,275

MOSFETs Enhanced Competitiveness Program [Member]

Restructuring Cost and Reserve [Line Items]

Schedule of Restructuring Reserve by Type of Cost [Table Text Block]

The following table summarizes the activity to date related to this program:

Expense recorded in 2013	$	2,328
Cash paid		(267	)
Balance at December 31, 2013	$	2,061
Expense recorded in 2014		6,025
Cash paid		(856	)
Balance at December 31, 2014	$	7,230
Expense recorded in 2015		5,367
Cash paid		(426	)
Foreign currency translation		1
Balance at December 31, 2015	$	12,172
Expense recorded in 2016		9,744
Cash paid		(15,686	)
Foreign currency translation		2
Balance at December 31, 2016	$	6,232
Expense recorded in 2017		448
Cash paid		(3,356	)
Balance at July 1, 2017	$	3,324

Long-Term Debt (Tables)

6 Months Ended

Jul. 01, 2017

Long-Term Debt [Abstract]

Schedule of long-term debt instruments

Long-term debt consists of the following:

	July 1, 2017			December 31, 2016

Credit facility	$	133,000		$	143,000
Convertible senior debentures, due 2040		109,291			108,120
Convertible senior debentures, due 2041		56,072			55,442
Convertible senior debentures, due 2042		61,956			61,341
Deferred financing costs		(9,990	)		(10,880	)
		350,329			357,023
Less current portion		-			-
	$	350,329		$	357,023

Key terms of the convertible debentures

	Due 2040			Due 2041			Due 2042
Issuance date	November 9, 2010			May 13, 2011			May 31, 2012
Maturity date	November 15, 2040			May 15, 2041			June 1, 2042
Principal amount	$	275,000		$	150,000		$	150,000
Cash coupon rate (per annum)		2.25	%		2.25	%		2.25	%
Nonconvertible debt borrowing rate at issuance (per annum)		8.00	%		8.375	%		7.50	%
Conversion rate effective June 13, 2017 (per $1 principal amount)		76.6985			55.9705			90.1791
Effective conversion price effective June 13, 2017 (per share)	$	13.04		$	17.87		$	11.09
130% of the conversion price (per share)	$	16.95		$	23.23		$	14.42
Call date	November 20, 2020			May 20, 2021			June 7, 2022

Liability and equity of component of convertible senior debentures

The carrying values of the liability and equity components of the convertible debentures are reflected in the Company's consolidated condensed balance sheets as follows:

	Principal amount of the debentures		Unamortized discount			Embedded derivative		Carrying value of liability component		Equity component (including temporary equity) - net carrying value
July 1, 2017
Due 2040	$	275,000		(166,058	)		349	$	109,291	$	110,094
Due 2041	$	150,000		(94,221	)		293	$	56,072	$	62,246
Due 2042	$	150,000		(88,228	)		184	$	61,956	$	57,874
Total	$	575,000	$	(348,507	)	$	826	$	227,319	$	230,214

December 31, 2016
Due 2040	$	275,000		(167,273	)		393	$	108,120	$	110,094
Due 2041	$	150,000		(94,843	)		285	$	55,442	$	62,246
Due 2042	$	150,000		(88,835	)		176	$	61,341	$	57,874
Total	$	575,000	$	(350,951	)	$	854	$	224,903	$	230,214

Convertible debentures, interest expense

Interest expense related to the debentures is reflected on the consolidated condensed statements of operations for the fiscal quarters ended:

	Contractual coupon interest		Non-cash amortization of debt discount		Non-cash amortization of deferred financing costs		Non-cash change in value of derivative liability			Total interest expense related to the debentures
July 1, 2017
Due 2040	$	1,547		613		22		(19	)	$	2,163
Due 2041	$	844		314		12		6		$	1,176
Due 2042	$	844		306		14		12		$	1,176
Total	$	3,235	$	1,233	$	48	$	(1	)	$	4,515

July 2, 2016
Due 2040	$	1,547		567		22		(41	)	$	2,095
Due 2041	$	844		289		13		(72	)	$	1,074
Due 2042	$	844		283		14		(14	)	$	1,127
Total	$	3,235	$	1,139	$	49	$	(127	)	$	4,296

Interest expense related to the debentures is reflected on the consolidated condensed statements of operations for the six fiscal months ended:

	Contractual coupon interest		Non-cash amortization of debt discount		Non-cash amortization of deferred financing costs		Non-cash change in value of derivative liability			Total interest expense related to the debentures
July 1, 2017
Due 2040	$	3,094		1,215		44		(44	)	$	4,309
Due 2041	$	1,688		622		24		8		$	2,342
Due 2042	$	1,688		607		27		8		$	2,330
Total	$	6,470	$	2,444	$	95	$	(28	)	$	8,981

July 2, 2016
Due 2040	$	3,094		1,123		44		(35	)	$	4,226
Due 2041	$	1,688		573		24		(34	)	$	2,251
Due 2042	$	1,688		563		27		(31	)	$	2,247
Total	$	6,470	$	2,259	$	95	$	(100	)	$	8,724

Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jul. 01, 2017

Accumulated Other Comprehensive Income (Loss) [Abstract]

Summary of components of other comprehensive income

The cumulative balance of each component of other comprehensive income (loss) and the income tax effects allocated to each component are as follows:

	Pension and other post-retirement actuarial items			Currency translation adjustment			Unrealized gain (loss) on available-for-sale securities			Total
Balance at January 1, 2017	$	(64,496	)	$	(31,266	)		1,110		$	(94,652	)
Other comprehensive income before reclassifications		-			70,816			1,204		$	72,020
Tax effect		-			-			(422	)	$	(422	)
Other comprehensive income before reclassifications, net of tax		-			70,816			782		$	71,598
Amounts reclassified out of AOCI		5,072			-			-		$	5,072
Tax effect		(1,521	)		-			-		$	(1,521	)
Amounts reclassified out of AOCI, net of tax		3,551			-			-		$	3,551
Net other comprehensive income	$	3,551		$	70,816		$	782		$	75,149
Balance at July 1, 2017	$	(60,945	)	$	39,550		$	1,892		$	(19,503	)

Pensions and Other Postretirement Benefits (Tables)

6 Months Ended

Jul. 01, 2017

Pension Plan, Defined Benefit [Member]

Defined Benefit Plan Disclosure [Line Items]

Net periodic benefit cost for pension and other postretirement benefit plans

The following table shows the components of the net periodic pension cost for the second fiscal quarters of 2017 and 2016 for the Company's defined benefit pension plans:

	Fiscal quarter ended July 1, 2017					Fiscal quarter ended July 2, 2016
	U.S. Plans		Non-U.S. Plans			U.S. Plans			Non-U.S. Plans

Net service cost	$	-	$	925		$	-		$	791
Interest cost		411		1,199			2,889			1,383
Expected return on plan assets		-		(518	)		(2,826	)		(542	)
Amortization of prior service cost		36		18			36			13
Amortization of losses		83		1,523			1,651			1,201
Curtailment and settlement losses		-		330			-			201
Net periodic benefit cost	$	530	$	3,477		$	1,750		$	3,047

The following table shows the components of the net periodic pension cost for the six fiscal months ended July 1, 2017 and July 2, 2016 for the Company's defined benefit pension plans:

	Six fiscal months ended July 1, 2017					Six fiscal months ended July 2, 2016
	U.S. Plans		Non-U.S. Plans			U.S. Plans			Non-U.S. Plans

Net service cost	$	-	$	1,828		$	-		$	1,565
Interest cost		821		2,366			5,889			2,736
Expected return on plan assets		-		(1,024	)		(5,651	)		(1,076	)
Amortization of prior service cost		72		36			72			25
Amortization of losses		165		3,001			3,301			2,372
Curtailment and settlement losses		-		652			-			396
Net periodic benefit cost	$	1,058	$	6,859		$	3,611		$	6,018

Other Postretirement Benefit Plan, Defined Benefit [Member]

Defined Benefit Plan Disclosure [Line Items]

Net periodic benefit cost for pension and other postretirement benefit plans

The following table shows the components of the net periodic benefit cost for the second fiscal quarters of 2017 and 2016 for the Company's other postretirement benefit plans:

	Fiscal quarter ended July 1, 2017					Fiscal quarter ended July 2, 2016
	U.S. Plans			Non-U.S. Plans		U.S. Plans			Non-U.S. Plans

Service cost	$	33		$	67	$	32		$	68
Interest cost		78			26		85			36
Amortization of prior service (credit)		(209	)		-		(209	)		-
Amortization of losses (gains)		(23	)		15		(7	)		17
Net periodic benefit cost	$	(121	)	$	108	$	(99	)	$	121

The following table shows the components of the net periodic pension cost for the six fiscal months ended July 1, 2017 and July 2, 2016 for the Company's other postretirement benefit plans:

	Six fiscal months ended July 1, 2017					Six fiscal months ended July 2, 2016
	U.S. Plans			Non-U.S. Plans		U.S. Plans			Non-U.S. Plans

Service cost	$	66		$	131	$	63		$	135
Interest cost		155			50		170			72
Amortization of prior service (credit)		(418	)		-		(418	)		-
Amortization of losses (gains)		(46	)		29		(15	)		34
Net periodic benefit cost	$	(243	)	$	210	$	(200	)	$	241

Stock-Based Compensation (Tables)

6 Months Ended

Jul. 01, 2017

Stock-Based Compensation [Abstract]

Summary of recognized stock-based compensation expense

The following table summarizes stock-based compensation expense recognized:

	Fiscal quarters ended				Six fiscal months ended
	July 1, 2017		July 2, 2016		July 1, 2017		July 2, 2016

Restricted stock units	$	676	$	1,085	$	2,880		2,169
Phantom stock units		-		-		163		117
Stock options		-		-		-		-
Total	$	676	$	1,085	$	3,043		2,286

Schedule of unrecognized compensation cost, nonvested awards

The following table summarizes unrecognized compensation cost and the weighted average remaining amortization periods at July 1, 2017 (amortization periods in years):

	Unrecognized Compensation Cost		Weighted Average Remaining Amortization Periods

Restricted stock units	$	4,251		1.5
Phantom stock units		-		0.0
Stock options		-		0.0
Total	$	4,251

Schedule of share-based compensation, restricted stock units award activity

RSU activity under the 2007 Program as of July 1, 2017 and changes during the six fiscal months then ended are presented below (number of RSUs in thousands):

	Number of RSUs			Weighted Average Grant-date Fair Value per Unit
Outstanding:
January 1, 2017		1,004		$	12.74
Granted		304			15.52
Vested*		(322	)		13.54
Cancelled or forfeited		-			-
Outstanding at July 1, 2017		986		$	13.34

Expected to vest at July 1, 2017		986

* The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy the statutory tax withholding requirements.

Schedule of share-based compensation arrangement by share-based units, vested and expected to vest

Vesting Date	Expected to Vest		Not Expected to Vest		Total
January 1, 2018		202		-		202
January 1, 2019		213		-		213
January 1, 2020		167		-		167

Schedule of share-based compensation, phantom stock units, Activity

Phantom stock unit activity under the phantom stock plan as of July 1, 2017 and changes during the six fiscal months then ended are presented below (number of phantom stock units in thousands):

	Number of units		Grant-date Fair Value per Unit
Outstanding:
January 1, 2017		145
Granted		10	$	16.25
Dividend equivalents issued		1
Outstanding at July 1, 2017		156

Segment Information (Tables)

6 Months Ended

Jul. 01, 2017

Segment Information [Abstract]

Schedule of Segment Reporting Information, by Segment

The following tables set forth business segment information:

	MOSFETs		Diodes		Optoelectronic Components		Resistors & Inductors		Capacitors		Total
Fiscal quarter ended July 1, 2017:
Product Sales	$	114,035	$	155,717	$	73,838	$	209,146	$	92,120	$	644,856
Royalty Revenues		-		-		-		36		-	$	36
Total Revenue	$	114,035	$	155,717	$	73,838	$	209,182	$	92,120	$	644,892

Gross Profit	$	25,315	$	41,130	$	25,466	$	62,090	$	18,962	$	172,963

Segment Operating Income	$	16,637	$	36,176	$	21,474	$	54,688	$	14,128	$	143,103

Fiscal quarter ended July 2, 2016:
Product Sales	$	102,219	$	142,118	$	68,059	$	192,717	$	84,856	$	589,969
Royalty Revenues		-		-		-		82		-	$	82
Total Revenue	$	102,219	$	142,118	$	68,059	$	192,799	$	84,856	$	590,051

Gross Profit	$	11,884	$	37,258	$	21,618	$	57,256	$	18,112	$	146,128

Segment Operating Income	$	2,560	$	31,550	$	15,844	$	48,571	$	12,632	$	111,157

Six fiscal months ended July 1, 2017:
Product Sales	$	219,564	$	300,612	$	139,520	$	409,523	$	181,889	$	1,251,108
Royalty Revenues		-		-		-		42		-	$	42
Total Revenue	$	219,564	$	300,612	$	139,520	$	409,565	$	181,889	$	1,251,150

Gross Profit	$	45,991	$	78,659	$	47,767	$	123,260	$	38,161	$	333,838

Segment Operating Income	$	28,398	$	68,915	$	38,389	$	108,585	$	28,300	$	272,587

Six fiscal months ended July 2, 2016:
Product Sales	$	203,152	$	277,502	$	130,834	$	376,133	$	172,876	$	1,160,497
Royalty Revenues		-		-		-		160		-	$	160
Total Revenue	$	203,152	$	277,502	$	130,834	$	376,293	$	172,876	$	1,160,657

Gross Profit	$	24,471	$	69,920	$	40,799	$	113,040	$	35,207	$	283,437

Segment Operating Income	$	5,178	$	58,193	$	29,498	$	95,454	$	23,935	$	212,258

Reconciliation of Operating Profit (Loss) from Segments to Consolidated

	Fiscal quarters ended						Six fiscal months ended
	July 1, 2017			July 2, 2016			July 1, 2017			July 2, 2016
Reconciliation:
Segment Operating Income	$	143,103		$	111,157		$	272,587		$	212,258
Restructuring and Severance Costs		(481	)		(4,467	)		(1,950	)		(10,942	)
Unallocated Selling, General, and Administrative Expenses		(60,586	)		(57,282	)		(123,913	)		(111,360	)
Consolidated Operating Income	$	82,036		$	49,408		$	146,724		$	89,956
Unallocated Other Income (Expense)		(6,327	)		(3,028	)		(20,573	)		(5,104	)
Consolidated Income (Loss) Before Taxes	$	75,709		$	46,380		$	126,151		$	84,852

Earnings Per Share (Tables)

6 Months Ended

Jul. 01, 2017

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table sets forth the computation of basic and diluted earnings (loss) per share attributable to Vishay stockholders (shares in thousands):

	Fiscal quarters ended				Six fiscal months ended
	July 1, 2017		July 2, 2016		July 1, 2017		July 2, 2016

Numerator:
Numerator for basic earnings per share:
Net earnings attributable to Vishay stockholders	$	56,190	$	33,086	$	92,909	$	61,100

Interest savings assuming conversion of dilutive exchangeable notes, net of tax		-		-		-		38

Numerator for diluted earnings per share:
Net earnings attributable to Vishay stockholders - diluted	$	56,190	$	33,086	$	92,909	$	61,138

Denominator:
Denominator for basic earnings per share:
Weighted average shares		146,226		147,500		146,173		147,597
Outstanding phantom stock units		155		143		155		142
Adjusted weighted average shares		146,381		147,643		146,328		147,739

Effect of dilutive securities:
Convertible and exchangeable debt instruments		8,651		1,995		8,500		2,311
Restricted stock units		268		207		260		187
Dilutive potential common shares		8,919		2,202		8,760		2,498

Denominator for diluted earnings per share:
Adjusted weighted average shares - diluted		155,300		149,845		155,088		150,237

Basic earnings per share attributable to Vishay stockholders	$	0.38	$	0.22	$	0.63	$	0.41

Diluted earnings per share attributable to Vishay stockholders	$	0.36	$	0.22	$	0.60	$	0.41

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

	Fiscal quarters ended				Six fiscal months ended
	July 1, 2017		July 2, 2016		July 1, 2017		July 2, 2016
Convertible notes:
Convertible Senior Debentures, due 2040		-		20,675		-		20,625
Convertible Senior Debentures, due 2041		8,371		8,230		8,356		8,209
Weighted average employee stock options		-		105		-		105
Weighted average other		581		610		581		610

Fair Value Measurements (Tables)

6 Months Ended

Jul. 01, 2017

Fair Value Measurements [Abstract]

Schedule of fair Value, Assets and Liabilities Measured on Recurring basis

The following table provides the financial assets and liabilities carried at fair value measured on a recurring basis:

	Total Fair Value			Level 1		Level 2		Level 3
July 1, 2017
Assets:
Assets held in rabbi trusts	$	43,502		$	27,940	$	15,562	$	-
Available for sale securities	$	4,335			4,335		-		-
	$	47,837		$	32,275	$	15,562	$	-
Liabilities:
Embedded derivative - convertible debentures due 2040	$	(349	)	$	-	$	-	$	(349	)
Embedded derivative - convertible debentures due 2041	$	(293	)		-		-		(293	)
Embedded derivative - convertible debentures due 2042	$	(184	)		-		-		(184	)
	$	(826	)	$	-	$	-	$	(826	)
December 31, 2016
Assets:
Assets held in rabbi trusts	$	41,917		$	27,297		14,620	$	-
Available for sale securities	$	3,969			3,969		-		-
	$	45,886		$	31,266	$	14,620	$	-
Liabilities:
Embedded derivative - convertible debentures due 2040	$	(393	)	$	-	$	-	$	(393	)
Embedded derivative - convertible debentures due 2041	$	(285	)		-		-		(285	)
Embedded derivative - convertible debentures due 2042	$	(176	)		-		-		(176	)
	$	(854	)	$	-	$	-	$	(854	)

Restructuring and Related Activities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Reserve [Roll Forward]
Restructuring and severance costs	$ 481	$ 4,467	$ 1,950	$ 10,942
MOSFETs Enhanced Competitiveness Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Current	3,324		3,324
Restructuring Reserve [Roll Forward]
Restructuring and severance costs	28	1,110	448	5,025	$ 9,744	$ 5,367	$ 6,025	$ 2,328
Cash paid			(3,356)		(15,686)	(426)	(856)	(267)
Foreign currency translation					2	1
Balance at end of period	$ 3,324		3,324		6,232	12,172	7,230	$ 2,061
Balance at beginning of period			6,232	12,172	12,172	7,230	$ 2,061
Term of restructuring program	2 years
Other Exit Costs			80
MOSFETs Enhanced Competitiveness Program [Member] \| Minimum [Member]
Restructuring Reserve [Roll Forward]
Expected Restructuring Costs	$ 24,000		24,000
MOSFETs Enhanced Competitiveness Program [Member] \| Maximum [Member]
Restructuring Reserve [Roll Forward]
Expected Restructuring Costs	27,000		27,000
Voluntary Separation/Retirement Program [Member]
Restructuring Reserve [Roll Forward]
Restructuring cost incurred to date	13,373		13,373
Global Cost Reduction Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Current	2,633		2,633
Restructuring Reserve [Roll Forward]
Restructuring and severance costs	453	3,357	1,502	5,917	9,918	13,753
Cash paid			(4,728)		(16,237)	(986)
Foreign currency translation			237		(34)	(150)
Balance at end of period	$ 3,275		3,275		6,264	$ 12,617
Balance at beginning of period			6,264	12,617	$ 12,617
Term of restructuring program	27 months
Expected Restructuring Costs	$ 30,000		30,000
Global Cost Reduction Program [Member] \| Diodes Segment [Member]
Restructuring Reserve [Roll Forward]
Restructuring and severance costs	13	130	13	578
Global Cost Reduction Program [Member] \| Optoelectronic Components Segment [Member]
Restructuring Reserve [Roll Forward]
Restructuring and severance costs	242	775	242	953
Global Cost Reduction Program [Member] \| Resistors And Inductors Segment [Member]
Restructuring Reserve [Roll Forward]
Restructuring and severance costs	84	1,504	935	2,522
Global Cost Reduction Program [Member] \| Capacitors Segment [Member]
Restructuring Reserve [Roll Forward]
Restructuring and severance costs	85	89	246	423
Global Cost Reduction Program [Member] \| Unallocated Amount to Segment [Member]
Restructuring Reserve [Roll Forward]
Restructuring and severance costs	$ 29	$ 859	66	$ 1,441
MOSFETs Enhanced Competitiveness Program Extension [Member]
Restructuring Reserve [Roll Forward]
Term of restructuring program	15 months
MOSFETs Enhanced Competitiveness Program Extension [Member] \| Minimum [Member]
Restructuring Reserve [Roll Forward]
Expected Restructuring Costs	$ 4,000		4,000
MOSFETs Enhanced Competitiveness Program Extension [Member] \| Maximum [Member]
Restructuring Reserve [Roll Forward]
Expected Restructuring Costs	$ 8,000		$ 8,000

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Income Taxes [Abstract]
Decrease in liabilities for unrecognized tax benefits			$ 2,225
Effect on Income Tax Expense (Benefit) [Line Items]
Cash repatriated during the current period			38,000
Remeasurement of repatriation deferred tax liability [Member]
Effect on Income Tax Expense (Benefit) [Line Items]
Deferred Other Tax Expense (Benefit)	$ 1,240	$ 1,217	$ 2,208	$ 1,986

Long-Term Debt (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017 USD ($) $ / shares	Jul. 02, 2016 USD ($)	Jul. 01, 2017 USD ($) $ / shares	Jul. 02, 2016 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Credit facility	$ 133,000		$ 133,000		$ 143,000
Deferred Financing Costs	(9,990)		(9,990)		(10,880)
Long-term debt	350,329		350,329		357,023
Less current portion	0		0		0
Long-term debt, less current portion	350,329		350,329		357,023
Debt Instruments [Abstract]
Principal amount of debt	$ 575,000		$ 575,000		575,000
Debt instrument percentage of conversion price (in hundredths)			130.00%
Debt instrument, Percentage of sale price of common stock (in hundredths)	98.00%		98.00%
Principal payments on long-term debt and capital leases			$ 0	$ (34,044)
Liability and equity components of convertible debentures [Abstract]
Principal amount of the debentures	$ 575,000		575,000		575,000
Unamortized discount	(348,507)		(348,507)		(350,951)
Embedded derivative	826		826		854
Carrying value of liability component	227,319		227,319		224,903
Equity component - net carrying value	230,214		230,214		230,214
Interest expense related to debentures [Abstract]
Contractual coupon interest	3,235	$ 3,235	6,470	6,470
Non-cash amortization of debt discount	1,233	1,139	2,444	2,259
Non-cash amortization of deferred financing costs	48	49	95	95
Non-cash change in value of derivative liability	(1)	(127)	(28)	(100)
Total interest expense related to the debentures	4,515	4,296	8,981	8,724
Convertible Senior Debentures, Due 2040 [Member]
Debt Instrument [Line Items]
Convertible Debt, Noncurrent	109,291		$ 109,291		108,120
Debt Instruments [Abstract]
Issuance date			Nov. 09, 2010
Debt maturity date			Nov. 15, 2040
Principal amount of debt	$ 275,000		$ 275,000		275,000
Stated rate of interest on debt (in hundredths)	2.25%		2.25%
Effective rate of interest on convertible senior debentures (in hundredths)	8.00%		8.00%
Debt conversion rate	76.6985
Debt effective conversion price \| $ / shares	$ 13.04		$ 13.04
Debt Instrument, Convertible, Stock Price Trigger \| $ / shares			$ 16.95
Convertible senior debentures call date	Nov. 20, 2020
Liability and equity components of convertible debentures [Abstract]
Principal amount of the debentures	$ 275,000		$ 275,000		275,000
Unamortized discount	(166,058)		(166,058)		(167,273)
Embedded derivative	349		349		393
Carrying value of liability component	109,291		109,291		108,120
Equity component - net carrying value	110,094		110,094		110,094
Interest expense related to debentures [Abstract]
Contractual coupon interest	1,547	1,547	3,094	3,094
Non-cash amortization of debt discount	613	567	1,215	1,123
Non-cash amortization of deferred financing costs	22	22	44	44
Non-cash change in value of derivative liability	(19)	(41)	(44)	(35)
Total interest expense related to the debentures	2,163	2,095	4,309	4,226
Convertible Senior Debentures, Due 2041 [Member]
Debt Instrument [Line Items]
Convertible Debt, Noncurrent	56,072		$ 56,072		55,442
Debt Instruments [Abstract]
Issuance date			May 13, 2011
Debt maturity date			May 15, 2041
Principal amount of debt	$ 150,000		$ 150,000		150,000
Stated rate of interest on debt (in hundredths)	2.25%		2.25%
Effective rate of interest on convertible senior debentures (in hundredths)	8.375%		8.375%
Debt conversion rate	55.9705
Debt effective conversion price \| $ / shares	$ 17.87		$ 17.87
Debt Instrument, Convertible, Stock Price Trigger \| $ / shares			$ 23.23
Convertible senior debentures call date	May 20, 2021
Liability and equity components of convertible debentures [Abstract]
Principal amount of the debentures	$ 150,000		$ 150,000		150,000
Unamortized discount	(94,221)		(94,221)		(94,843)
Embedded derivative	293		293		285
Carrying value of liability component	56,072		56,072		55,442
Equity component - net carrying value	62,246		62,246		62,246
Interest expense related to debentures [Abstract]
Contractual coupon interest	844	844	1,688	1,688
Non-cash amortization of debt discount	314	289	622	573
Non-cash amortization of deferred financing costs	12	13	24	24
Non-cash change in value of derivative liability	6	(72)	8	(34)
Total interest expense related to the debentures	1,176	1,074	2,342	2,251
Convertible Senior Debentures, Due 2042 [Member]
Debt Instrument [Line Items]
Convertible Debt, Noncurrent	61,956		$ 61,956		61,341
Debt Instruments [Abstract]
Issuance date			May 31, 2012
Debt maturity date			Jun. 01, 2042
Principal amount of debt	$ 150,000		$ 150,000		150,000
Stated rate of interest on debt (in hundredths)	2.25%		2.25%
Effective rate of interest on convertible senior debentures (in hundredths)	7.50%		7.50%
Debt conversion rate	90.1791
Debt effective conversion price \| $ / shares	$ 11.09		$ 11.09
Debt Instrument, Convertible, Stock Price Trigger \| $ / shares			$ 14.42
Convertible senior debentures call date	Jun. 07, 2022
Liability and equity components of convertible debentures [Abstract]
Principal amount of the debentures	$ 150,000		$ 150,000		150,000
Unamortized discount	(88,228)		(88,228)		(88,835)
Embedded derivative	184		184		176
Carrying value of liability component	61,956		61,956		61,341
Equity component - net carrying value	57,874		57,874		$ 57,874
Interest expense related to debentures [Abstract]
Contractual coupon interest	844	844	1,688	1,688
Non-cash amortization of debt discount	306	283	607	563
Non-cash amortization of deferred financing costs	14	14	27	27
Non-cash change in value of derivative liability	12	(14)	8	(31)
Total interest expense related to the debentures	$ 1,176	$ 1,127	$ 2,330	$ 2,247

Other Income (Expense) (Details) - USD ($) $ in Thousands	6 Months Ended
Other Income (Expense) (Details) - USD ($) $ in Thousands	Jul. 01, 2017	Jul. 02, 2016
Schedule of Equity Method Investments [Line Items]
Loss on disposal of equity affiliate	$ 7,060	$ 0
Amounts reclassified out of AOCI, net of tax	3,551
Equity affiliate [Member]
Schedule of Equity Method Investments [Line Items]
Amounts reclassified out of AOCI, net of tax	$ 1,110

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			$ (94,652)
Other comprehensive income before reclassifications			72,020
Tax effect			(422)
Other comprehensive income before reclassifications, net of tax			71,598
Amounts reclassified out of AOCI			5,072
Tax effect of reclassification			(1,521)
Amounts reclassified out of AOCI, net of tax			3,551
Other comprehensive income (loss)	$ 55,250	$ (20,108)	75,149	$ 14,919
Ending Balance	(19,503)		(19,503)
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			1,110
Other comprehensive income before reclassifications			1,204
Tax effect			(422)
Other comprehensive income before reclassifications, net of tax			782
Amounts reclassified out of AOCI			0
Tax effect of reclassification			0
Amounts reclassified out of AOCI, net of tax			0
Other comprehensive income (loss)			782
Ending Balance	1,892		1,892
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			(31,266)
Other comprehensive income before reclassifications			70,816
Tax effect			0
Other comprehensive income before reclassifications, net of tax			70,816
Amounts reclassified out of AOCI			0
Tax effect of reclassification			0
Amounts reclassified out of AOCI, net of tax			0
Other comprehensive income (loss)			70,816
Ending Balance	39,550		39,550
Pension and Other Post-Retirement Actuarial Items [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			(64,496)
Other comprehensive income before reclassifications			0
Tax effect			0
Other comprehensive income before reclassifications, net of tax			0
Amounts reclassified out of AOCI			5,072
Tax effect of reclassification			(1,521)
Amounts reclassified out of AOCI, net of tax			3,551
Other comprehensive income (loss)			3,551
Ending Balance	$ (60,945)		$ (60,945)

Pensions and Other Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	$ 925	$ 791	$ 1,828	$ 1,565
Interest cost	1,199	1,383	2,366	2,736
Expected return on plan assets	(518)	(542)	(1,024)	(1,076)
Amortization of prior service cost (credit)	18	13	36	25
Amortization of losses (gains)	1,523	1,201	3,001	2,372
Curtailments and settlements	330	201	652	396
Net periodic benefit cost	3,477	3,047	6,859	6,018
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	0	0	0	0
Interest cost	411	2,889	821	5,889
Expected return on plan assets	0	(2,826)	0	(5,651)
Amortization of prior service cost (credit)	36	36	72	72
Amortization of losses (gains)	83	1,651	165	3,301
Curtailments and settlements	0	0	0	0
Net periodic benefit cost	530	1,750	1,058	3,611
U.S. Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	33	32	66	63
Interest cost	78	85	155	170
Amortization of prior service cost (credit)	(209)	(209)	(418)	(418)
Amortization of losses (gains)	(23)	(7)	(46)	(15)
Net periodic benefit cost	(121)	(99)	(243)	(200)
Non-U.S. Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	67	68	131	135
Interest cost	26	36	50	72
Amortization of prior service cost (credit)	0	0	0	0
Amortization of losses (gains)	15	17	29	34
Net periodic benefit cost	108	$ 121	$ 210	$ 241
Republic of China (Taiwan) [Member] \| Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Company pension contributions	$ 4,409

Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

6 Months Ended

Jul. 01, 2017

Jul. 02, 2016

Jul. 01, 2017

Jul. 02, 2016

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation expense recognized

$ 676

$ 1,085

$ 3,043

$ 2,286

Unrecognized Compensation Cost

$ 4,251

Expiration date of the 2007 stock incentive plan

May 20, 2024

Maximum number of shares granted under restricted stock, unrestricted stock, RSU's and stock options to officers, employees and employee directors (in shares)

6,500,000

Stock Options Outstanding:

Balance

77,000

Balance (in dollars per share)

$ 16.29

Exercised (in shares)

(77,334)

Vested and expected to vest [Abstract]

Stock options exercised (in shares)

77,334

Intrinsic value under share based compensation scheme

$ 20

Stock Options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation expense recognized

$ 0

Unrecognized Compensation Cost

$ 0

Weighted Average Remaining Amortization Periods

0 years

Restricted Stock Units (RSUs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation expense recognized

676

1,085

$ 2,880

2,169

Unrecognized Compensation Cost

$ 4,251

Weighted Average Remaining Amortization Periods

1 year 6 months

Equity Awards Other Than Options Outstanding:

Balance (in shares)

1,004,000

Balance (in dollars per share)

$ 12.74

Granted (in shares)

304,000

Granted (in dollars per share)

$ 15.52

Vested (in shares)

^[1]

(322,000)

Vested (in dollars per share)

^[1]

$ 13.54

Cancelled or forfeited (in shares)

Cancelled or forfeited (in dollars per share)

$ 0

Balance (in shares)

986,000

Balance (in dollars per share)

$ 13.34

Expected to vest (in shares)

986,000

Phantom Share Units (PSUs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation expense recognized

$ 0

$ 163

$ 117

Unrecognized Compensation Cost

$ 0

Weighted Average Remaining Amortization Periods

0 years

Equity Awards Other Than Options Outstanding:

Balance (in shares)

145,000

Granted (in shares)

10,000

Granted (in dollars per share)

$ 16.25

Dividend equivalents issued

1,000

Balance (in shares)

156,000

Scheduled to Vest January 1, 2018 [Member] | Performance Vested Restricted Stock Units [Member]

Equity Awards Other Than Options Outstanding:

Balance (in shares)

202,000

Expected to vest (in shares)

202,000

Not expected to vest (in shares)

Scheduled to Vest January 1, 2019 [Member] | Performance Vested Restricted Stock Units [Member]

Equity Awards Other Than Options Outstanding:

Balance (in shares)

213,000

Expected to vest (in shares)

213,000

Not expected to vest (in shares)

Scheduled to Vest January 1, 2020 [Member] | Performance Vested Restricted Stock Units [Member]

Equity Awards Other Than Options Outstanding:

Balance (in shares)

167,000

Expected to vest (in shares)

167,000

Not expected to vest (in shares)

[1]	The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy the statutory tax withholding requirements.

Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
Segment Information (Details) $ in Thousands	Jul. 01, 2017 USD ($)	Jul. 02, 2016 USD ($)	Jul. 01, 2017 USD ($) Segment	Jul. 02, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| Segment			5
Product Sales	$ 644,856	$ 589,969	$ 1,251,108	$ 1,160,497
Royalty Revenues	36	82	42	160
Total Revenue	644,892	590,051	1,251,150	1,160,657
Gross Margin	172,963	146,128	333,838	283,437
Segment Operating Income	143,103	111,157	272,587	212,258
Restructuring and severance Costs	(481)	(4,467)	(1,950)	(10,942)
Operating income	82,036	49,408	146,724	89,956
Unallocated Other Income (Expense)	(6,327)	(3,028)	(20,573)	(5,104)
Income before taxes	75,709	46,380	126,151	84,852
MOSFETS Segment [Member]
Segment Reporting Information [Line Items]
Product Sales	114,035	102,219	219,564	203,152
Royalty Revenues	0	0	0	0
Total Revenue	114,035	102,219	219,564	203,152
Gross Margin	25,315	11,884	45,991	24,471
Segment Operating Income	16,637	2,560	28,398	5,178
Diodes Segment [Member]
Segment Reporting Information [Line Items]
Product Sales	155,717	142,118	300,612	277,502
Royalty Revenues	0	0	0	0
Total Revenue	155,717	142,118	300,612	277,502
Gross Margin	41,130	37,258	78,659	69,920
Segment Operating Income	36,176	31,550	68,915	58,193
Optoelectronic Components Segment [Member]
Segment Reporting Information [Line Items]
Product Sales	73,838	68,059	139,520	130,834
Royalty Revenues	0	0	0	0
Total Revenue	73,838	68,059	139,520	130,834
Gross Margin	25,466	21,618	47,767	40,799
Segment Operating Income	21,474	15,844	38,389	29,498
Resistors And Inductors Segment [Member]
Segment Reporting Information [Line Items]
Product Sales	209,146	192,717	409,523	376,133
Royalty Revenues	36	82	42	160
Total Revenue	209,182	192,799	409,565	376,293
Gross Margin	62,090	57,256	123,260	113,040
Segment Operating Income	54,688	48,571	108,585	95,454
Capacitors Segment [Member]
Segment Reporting Information [Line Items]
Product Sales	92,120	84,856	181,889	172,876
Royalty Revenues	0	0	0	0
Total Revenue	92,120	84,856	181,889	172,876
Gross Margin	18,962	18,112	38,161	35,207
Segment Operating Income	14,128	12,632	28,300	23,935
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Segment Operating Income	(60,586)	(57,282)	(123,913)	(111,360)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Segment Operating Income	143,103	111,157	272,587	212,258
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Restructuring and severance Costs	(481)	(4,467)	(1,950)	(10,942)
Unallocated Other Income (Expense)	$ (6,327)	$ (3,028)	$ (20,573)	$ (5,104)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Numerator for basic earnings per share:
Net earnings attributable to Vishay stockholders	$ 56,190	$ 33,086	$ 92,909	$ 61,100
Adjustment to the numerator for continuing operations and net earnings:
Interest savings assuming conversion of dilutive convertible and exchangeable notes, net of tax	0	0	0	38
Numerator for diluted earnings per share:
Net earnings attributable to Vishay stockholders - diluted	$ 56,190	$ 33,086	$ 92,909	$ 61,138
Denominator for basic earnings per share:
Weighted average shares	146,226	147,500	146,173	147,597
Outstanding phantom stock units	155	143	155	142
Adjusted weighted average shares (basic)	146,381	147,643	146,328	147,739
Effect of dilutive securities:
Convertible and exchangeable debt instruments	8,651	1,995	8,500	2,311
Restricted stock units	268	207	260	187
Dilutive potential common shares	8,919	2,202	8,760	2,498
Denominator for diluted earnings per share:
Adjusted weighted average shares (diluted)	155,300	149,845	155,088	150,237
Basic earnings per share attributable to Vishay stockholders (in dollars per share)	$ 0.38	$ 0.22	$ 0.63	$ 0.41
Diluted earnings per share attributable to Vishay stockholders (in dollars per share)	$ 0.36	$ 0.22	$ 0.60	$ 0.41
Convertible Senior Debentures, Due 2040 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount (in shares)	0	20,675	0	20,625
Minimum market price of common stock for inclusion of shares issuable upon conversion of senior debentures for calculation of diluted earnings per share (in dollars per share)	$ 13.04		$ 13.04
Convertible Senior Debentures, Due 2041 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount (in shares)	8,371	8,230	8,356	8,209
Minimum market price of common stock for inclusion of shares issuable upon conversion of senior debentures for calculation of diluted earnings per share (in dollars per share)	$ 17.87		$ 17.87
Convertible Senior Debentures, Due 2042 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Minimum market price of common stock for inclusion of shares issuable upon conversion of senior debentures for calculation of diluted earnings per share (in dollars per share)	$ 11.09		$ 11.09
Weighted average employees stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount (in shares)	0	105	0	105
Weighted average other [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount (in shares)	581	610	581	610

Fair Value Measurements (Details) - USD ($) $ in Thousands	6 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Thousands	Jul. 01, 2017	Dec. 31, 2016
Assets:
Held-to-maturity Securities, Transferred Security, at Carrying Value	$ 0
Held-to-maturity Securities, Unrecognized Holding Gain	0
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities	0
Liabilities:
Embedded derivative	(826)	$ (854)
Long-term Debt, Fair Value	873,500	860,600
Carrying value of long-term debt, excluding derivative liabilities	359,493	367,049
Derivative, Notional Amount	105,644	100,000
Fair Value, Measurements, Recurring [Member]
Assets:
Assets held in rabbi trusts	43,502	41,917
Available for sale securities	4,335	3,969
Fair Value Assets	47,837	45,886
Liabilities:
Fair Value Liabilities	(826)	(854)
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Assets held in rabbi trusts	27,940	27,297
Available for sale securities	4,335	3,969
Fair Value Assets	32,275	31,266
Liabilities:
Fair Value Liabilities	0	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Assets held in rabbi trusts	15,562	14,620
Available for sale securities	0	0
Fair Value Assets	15,562	14,620
Liabilities:
Fair Value Liabilities	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Assets held in rabbi trusts	0	0
Available for sale securities	0	0
Fair Value Assets	0	0
Liabilities:
Fair Value Liabilities	(826)	(854)
Convertible Senior Debentures, Due 2040 [Member]
Liabilities:
Embedded derivative	(349)	(393)
Convertible Senior Debentures, Due 2040 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	(349)	(393)
Convertible Senior Debentures, Due 2040 [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	0	0
Convertible Senior Debentures, Due 2040 [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	0	0
Convertible Senior Debentures, Due 2040 [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	(349)	(393)
Convertible Senior Debentures, Due 2041 [Member]
Liabilities:
Embedded derivative	(293)	(285)
Convertible Senior Debentures, Due 2041 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	(293)	(285)
Convertible Senior Debentures, Due 2041 [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	0	0
Convertible Senior Debentures, Due 2041 [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	0	0
Convertible Senior Debentures, Due 2041 [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	(293)	(285)
Convertible Senior Debentures, Due 2042 [Member]
Liabilities:
Embedded derivative	(184)	(176)
Convertible Senior Debentures, Due 2042 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	(184)	(176)
Convertible Senior Debentures, Due 2042 [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	0	0
Convertible Senior Debentures, Due 2042 [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	0	0
Convertible Senior Debentures, Due 2042 [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	$ (184)	$ (176)