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Long-Term Debt (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 02, 2016 USD ($) | Apr. 02, 2016 USD ($) | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2013 USD ($) shares | Dec. 13, 2002 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  | $ 370,470 | $ 357,023 |  |  |
Credit facility |  |  | 150,000 | 143,000 |  |  |
Deferred Financing Costs |  |  | (9,101) | (10,880) |  |  |
Less current portion |  |  | 0 | 0 |  |  |
Long-term debt, less current portion |  |  | 370,470 | 357,023 |  |  |
Liability and equity components of convertible debentures [Abstract] |  |  |  |  |  |  |
Principal amount of the debentures |  |  | 575,000 | 575,000 |  |  |
Unamortized discount |  |  | (345,967) | (350,951) |  |  |
Embedded derivative |  |  | 538 | 854 |  |  |
Carrying value of liability component |  |  | 229,571 | 224,903 |  |  |
Equity component - net carrying value |  |  | 230,214 | 230,214 |  |  |
Interest expense related to debentures [Abstract] |  |  |  |  |  |  |
Contractual coupon interest |  |  | 12,938 | 12,938 | $ 12,938 |  |
Non-cash amortization of debt discount |  |  | 4,984 | 4,610 | 4,264 |  |
Non-cash amortization of deferred financing costs |  |  | 189 | 189 | 189 |  |
Non-cash change in value of derivative liability |  |  | (316) | (462) | 211 |  |
Total interest expense related to the debentures |  |  | 17,795 | 17,275 | 17,602 |  |
Principal payments on long-term debt and capital leases |  |  | 0 | (34,044) | 0 |  |
Committed and uncommitted short-term credit lines |  |  | 15,000 | 11,000 |  |  |
Aggregate annual maturities of long-term debt [Abstract] |  |  |  |  |  |  |
2018 |  |  | 0 |  |  |  |
2019 |  |  | 0 |  |  |  |
2020 |  |  | 150,000 |  |  |  |
2021 |  |  | 0 |  |  |  |
2022 |  |  | 0 |  |  |  |
Thereafter |  |  | 575,000 |  |  |  |
Interest paid |  |  | 21,216 | 19,316 | 19,134 |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 640,000 |  |  |  |
Line of Credit Facility, Initiation Date |  |  | Dec. 10, 2015 |  |  |  |
Expiration date |  |  | Dec. 10, 2020 |  |  |  |
Maximum incremental revolving commitments |  |  | $ 50,000 |  |  |  |
Interest rate description |  |  | Borrowings under the Amended and Restated Credit Facility bear interest at LIBOR plus an interest margin. The applicable interest margin is based on Vishay's leverage ratio. Based on Vishay's current leverage ratio, borrowings bear interest at LIBOR plus 1.75%. Vishay also pays a fee, also based on its leverage ratio, on undrawn amounts. The undrawn commitment fee, based on Vishay’s current leverage ratio, is 0.35% per annum. The previous credit agreement required Vishay to pay facility fees on the entire commitment amount. |  |  |  |
Basis spread on variable rate (in hundredths) |  |  | 1.75% |  |  |  |
Commitment fees (in hundredths) |  |  | 0.35% |  |  |  |
Covenant terms |  |  | The Amended and Restated Credit Facility allows an unlimited amount of defined “Restricted Payments,” which include cash dividends and share repurchases, provided the Company’s pro forma leverage ratio is less than 2.25 to 1. If the Company’s leverage ratio is greater than 2.25 to 1, the Amended and Restated Credit Facility allows such payments up to $75,000 per annum (subject to a cap of $225,000 for the term of the facility). |  |  |  |
Line of Credit Facility, Covenant Compliance |  |  | The Credit Facility also contains customary events of default, including, but not limited to, failure to pay principal or interest, failure to pay or default under other material debt, material misrepresentation or breach of warranty, violation of certain covenants, a change of control, the commencement of bankruptcy proceedings, the insolvency of Vishay or certain of its significant subsidiaries, and the rendering of a judgment in excess of $25,000 against Vishay or certain of its significant subsidiaries. Upon the occurrence of an event of default under the Credit Facility, the Company's obligations under the credit facility may be accelerated and the lending commitments under the credit facility terminated. |  |  |  |
Available borrowing capacity |  |  | $ 486,211 | 490,136 |  |  |
Letters of credit outstanding |  |  | 3,789 | 6,864 |  |  |
Credit facility accelerated repayment minimum judgement |  |  | 25,000 |  |  |  |
Exchangeable Unsecured Notes, Due 2102 [Member] |  |  |  |  |  |  |
Liability and equity components of convertible debentures [Abstract] |  |  |  |  |  |  |
Principal amount of the debentures |  |  |  |  |  | $ 38,642 | $ 105,000
Interest expense related to debentures [Abstract] |  |  |  |  |  |  |
Number of shares of common stock the Notes are exchangeable into (in shares) | shares |  |  |  |  |  | 2,511,742 |
Principal amount of repurchased debt | $ 12,436 | $ 26,206 |  |  |  |  |
Principal payments on long-term debt and capital leases | $ 11,449 | $ 22,595 |  |  |  |  |
Repurchase Date | Jun. 28, 2016 | Mar. 31, 2016 |  |  |  |  |
Number of shares of common stock the Notes are exchangeable into (in shares) | shares |  |  |  |  |  | 2,511,742 |
Convertible Senior Debentures, Due 2040 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Convertible Debt, Noncurrent |  |  | $ 110,412 | 108,120 |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Convertible senior debentures issuance date |  |  | Nov. 09, 2010 |  |  |  |
Debt maturity date |  |  | Nov. 15, 2040 |  |  |  |
Cash coupon rate |  |  | 2.25% |  |  |  |
Nonconvertible debt borrowing rate at issuance |  |  | 8.00% |  |  |  |
Effective conversion rate |  |  | 77.2085 |  |  |  |
Effective conversion price (in dollars per share) | $ / shares |  |  | $ 12.95 |  |  |  |
130% of the conversion price | $ / shares |  |  | $ 16.84 |  |  |  |
Convertible senior debentures call date |  |  | Nov. 20, 2020 |  |  |  |
Debt instrument percentage of conversion price (in hundredths) |  |  | 130.00% |  |  |  |
Debt instrument, Percentage of sale price of common stock (in hundredths) |  |  | 98.00% |  |  |  |
Liability and equity components of convertible debentures [Abstract] |  |  |  |  |  |  |
Principal amount of the debentures |  |  | $ 275,000 | 275,000 |  |  |
Unamortized discount |  |  | (164,794) | (167,273) |  |  |
Embedded derivative |  |  | 206 | 393 |  |  |
Carrying value of liability component |  |  | 110,412 | 108,120 |  |  |
Equity component - net carrying value |  |  | 110,094 | 110,094 |  |  |
Interest expense related to debentures [Abstract] |  |  |  |  |  |  |
Contractual coupon interest |  |  | 6,188 | 6,188 | 6,188 |  |
Non-cash amortization of debt discount |  |  | 2,479 | 2,292 | 2,120 |  |
Non-cash amortization of deferred financing costs |  |  | 88 | 88 | 88 |  |
Non-cash change in value of derivative liability |  |  | (187) | (183) | 50 |  |
Total interest expense related to the debentures |  |  | $ 8,568 | 8,385 | 8,446 |  |
Debt instrument percentage of conversion price (in hundredths) |  |  | 130.00% |  |  |  |
Convertible Senior Debentures, Due 2041 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Convertible Debt, Noncurrent |  |  | $ 56,641 | 55,442 |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Convertible senior debentures issuance date |  |  | May 13, 2011 |  |  |  |
Debt maturity date |  |  | May 15, 2041 |  |  |  |
Cash coupon rate |  |  | 2.25% |  |  |  |
Nonconvertible debt borrowing rate at issuance |  |  | 8.375% |  |  |  |
Effective conversion rate |  |  | 56.3427 |  |  |  |
Effective conversion price (in dollars per share) | $ / shares |  |  | $ 17.75 |  |  |  |
130% of the conversion price | $ / shares |  |  | $ 23.08 |  |  |  |
Convertible senior debentures call date |  |  | May 20, 2021 |  |  |  |
Debt instrument percentage of conversion price (in hundredths) |  |  | 130.00% |  |  |  |
Debt instrument, Percentage of sale price of common stock (in hundredths) |  |  | 98.00% |  |  |  |
Liability and equity components of convertible debentures [Abstract] |  |  |  |  |  |  |
Principal amount of the debentures |  |  | $ 150,000 | 150,000 |  |  |
Unamortized discount |  |  | (93,573) | (94,843) |  |  |
Embedded derivative |  |  | 214 | 285 |  |  |
Carrying value of liability component |  |  | 56,641 | 55,442 |  |  |
Equity component - net carrying value |  |  | 62,246 | 62,246 |  |  |
Interest expense related to debentures [Abstract] |  |  |  |  |  |  |
Contractual coupon interest |  |  | 3,375 | 3,375 | 3,375 |  |
Non-cash amortization of debt discount |  |  | 1,270 | 1,171 | 1,078 |  |
Non-cash amortization of deferred financing costs |  |  | 47 | 47 | 47 |  |
Non-cash change in value of derivative liability |  |  | (71) | (153) | 97 |  |
Total interest expense related to the debentures |  |  | $ 4,621 | 4,440 | 4,597 |  |
Debt instrument percentage of conversion price (in hundredths) |  |  | 130.00% |  |  |  |
Convertible Senior Debentures 2042 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Convertible Debt, Noncurrent |  |  | $ 62,518 | 61,341 |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Convertible senior debentures issuance date |  |  | May 31, 2012 |  |  |  |
Debt maturity date |  |  | Jun. 01, 2042 |  |  |  |
Cash coupon rate |  |  | 2.25% |  |  |  |
Nonconvertible debt borrowing rate at issuance |  |  | 7.50% |  |  |  |
Effective conversion rate |  |  | 90.7787 |  |  |  |
Effective conversion price (in dollars per share) | $ / shares |  |  | $ 11.02 |  |  |  |
130% of the conversion price | $ / shares |  |  | $ 14.33 |  |  |  |
Convertible senior debentures call date |  |  | Jun. 07, 2022 |  |  |  |
Debt instrument percentage of conversion price (in hundredths) |  |  | 130.00% |  |  |  |
Debt instrument, Percentage of sale price of common stock (in hundredths) |  |  | 98.00% |  |  |  |
Liability and equity components of convertible debentures [Abstract] |  |  |  |  |  |  |
Principal amount of the debentures |  |  | $ 150,000 | 150,000 |  |  |
Unamortized discount |  |  | (87,600) | (88,835) |  |  |
Embedded derivative |  |  | 118 | 176 |  |  |
Carrying value of liability component |  |  | 62,518 | 61,341 |  |  |
Equity component - net carrying value |  |  | 57,874 | 57,874 |  |  |
Interest expense related to debentures [Abstract] |  |  |  |  |  |  |
Contractual coupon interest |  |  | 3,375 | 3,375 | 3,375 |  |
Non-cash amortization of debt discount |  |  | 1,235 | 1,147 | 1,066 |  |
Non-cash amortization of deferred financing costs |  |  | 54 | 54 | 54 |  |
Non-cash change in value of derivative liability |  |  | (58) | (126) | 64 |  |
Total interest expense related to the debentures |  |  | $ 4,606 | $ 4,450 | $ 4,559 |  |
Debt instrument percentage of conversion price (in hundredths) |  |  | 130.00% |  |  |  |

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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600 + Details
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- Definition The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Committed and uncommitted short-term credit lines with various U.S. and foreign banks held by the Company. + References No definition available. + Details
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