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Long-Term Debt (Details) (USD $) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2010 Credit Facility [Member] | Dec. 31, 2009 Credit Facility [Member] | Dec. 31, 2011 Credit Facility [Member] | Dec. 31, 2011 Exchangeable Unsecured Notes, Due 2102 [Member] | Dec. 31, 2010 Exchangeable Unsecured Notes, Due 2102 [Member] | Dec. 31, 2010 Convertible Subordinated Notes, due 2023 [Member] | Dec. 31, 2008 Convertible Subordinated Notes, due 2023 [Member] | Dec. 31, 2009 Convertible Subordinated Notes, due 2023 [Member] | Dec. 31, 2011 Convertible Senior Debentures, Due 2040 [Member] | Dec. 31, 2010 Convertible Senior Debentures, Due 2040 [Member] | Dec. 31, 2011 Convertible Senior Debentures, Due 2041 [Member] | Dec. 31, 2010 Convertible Senior Debentures, Due 2041 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 399,054,000 | $ 431,682,000 |  | $ 240,000,000 |  | $ 155,000,000 | $ 95,042,000 | $ 95,042,000 |  |  |  | $ 98,463,000 | $ 96,640,000 | $ 50,549,000 | $ 0
Less current portion | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, less current portion | 399,054,000 | 431,682,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding | 286,995,000 | 210,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 450,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration date | December 1, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum incremental revolving commitments | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repayments | 85,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in hundredths) | 1.65% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fees (in hundredths) | 0.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant terms | On September 8, 2011, Vishay entered into an amendment to the Credit Facility. The amendment effectively permits up to $300,000 of additional share repurchases, conditioned upon Vishay maintaining (i) a pro forma leverage ratio of 2.75 to 1.00, (ii) a pro forma interest expense coverage ratio of 2.00 to 1.00, and (iii) $400,000 of available liquidity, as defined in the amendment. The amount and timing of any future stock repurchases remains subject to authorization of Vishay’s Board of Directors. Other significant terms and conditions of the Credit Facility have not changed. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold for judgements which would represent an event of default | On September 8, 2011, Vishay entered into an amendment to the Credit Facility. The amendment effectively permits up to $300,000 of additional share repurchases, conditioned upon Vishay maintaining (i) a pro forma leverage ratio of 2.75 to 1.00, (ii) a pro forma interest expense coverage ratio of 2.00 to 1.00, and (iii) $400,000 of available liquidity, as defined in the amendment. The amount and timing of any future stock repurchases remains subject to authorization of Vishay’s Board of Directors. Other significant terms and conditions of the Credit Facility have not changed. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding | 8,005,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan principal repayments |  |  |  | 90,000,000 | 25,000,000 |  |  |  |  |  |  |  |  |  |
Committed and uncommitted short-term credit lines | 15,500,000 | 33,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior debentures issuance date |  |  |  |  |  |  |  |  |  |  |  |  | November 9, 2010 | May 13, 2011 |
Principal amount of debt |  |  |  |  |  |  | 105,000,000 |  |  |  | 500,000,000 | 275,000,000 | 275,000,000 | 150,000,000 |
Common stock, shares repurchased (in shares) | 8,620,689 | 21,721,959 |  |  |  |  |  |  |  |  |  |  |  |  |
Liability and equity components of convertible debentures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of the debentures |  |  |  |  |  |  | 105,000,000 |  |  |  | 500,000,000 | 275,000,000 | 275,000,000 | 150,000,000 |
Unamortized discount |  |  |  |  |  |  |  |  |  |  |  | (177,131,000) | (178,679,000) | (99,843,000) |
Embedded derivative |  |  |  |  |  |  |  |  |  |  |  | 594,000 | 319,000 | 392,000 |
Carrying value of liability component |  |  |  |  |  |  |  |  |  |  |  | 98,463,000 | 96,640,000 | 50,549,000 |
Equity component - net carrying value |  |  |  |  |  |  |  |  |  |  |  | 110,094,000 | 110,094,000 | 62,246,000 |
Stated rate of interest on debt (in hundredths) |  |  |  |  |  |  |  |  |  |  | 3.625% |  | 2.25% | 2.25% |
Effective rate of interest on convertible senior debentures (in hundredths) |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  | 8.375% |
Interest expense related to debentures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual coupon interest |  |  |  |  |  |  |  |  |  |  |  | 6,188,000 | 773,000 | 2,128,000 |
Non-cash amortization of debt discount | 2,046,000 | 188,000 | 0 |  |  |  |  |  |  |  |  | 1,548,000 | 188,000 | 498,000 |
Non-cash amortization of deferred financing costs |  |  |  |  |  |  |  |  |  |  |  | 88,000 | 11,000 | 29,000 |
Non-cash change in value of derivative liability |  |  |  |  |  |  |  |  |  |  |  | 275,000 | (55,000) | 181,000 |
Total interest expense related to the debentures |  |  |  |  |  |  |  |  |  |  |  | 8,099,000 | 917,000 | 2,836,000 |
Debt instrument percentage of conversion price (in hundredths) |  |  |  |  |  |  |  |  |  |  |  | 130.00% |  | 130.00% |
Debt instrument, conversion price amount (in dollars per share) |  |  |  |  |  |  | $ 15.39 |  |  |  |  | $ 18.04 |  | $ 24.73 |
Debt instrument, Percentage of sale price of common stock (in hundredths) |  |  |  |  |  |  |  |  |  |  |  | 98.00% |  | 98.00% |
Debt instrument, initial conversion shares of common stock (shares per $1000 principal) |  |  |  |  |  |  |  |  |  |  |  | 72.0331 |  | 52.5659 |
Debt instrument, principal amount of debentures |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  | 1,000 |
Debt instrument, initial conversion price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 13.88 |  | $ 19.02 |
Debt instrument, percentage of initial conversion price premium (in hundredths) |  |  |  |  |  |  |  |  |  |  |  | 12.50% |  | 12.50% |
Number of shares of common stock the Notes are exchangeable into (in shares) |  |  |  |  |  |  | 6,176,471 |  |  |  |  |  |  |  |
Percentage of note holders exercising option to require the company to repurchase their notes (in hundredths) |  |  |  |  |  |  |  |  |  | 99.60% |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  | 1,870,000 |  |  |  |  |  |
Israeli bank loan repayment |  | 13,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate annual maturities of long-term debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2011 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 155,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter | 520,042,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest paid | $ 14,084,000 | $ 9,120,000 | $ 10,243,000 |  |  |  |  |  |  |  |  |  |  |  |

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