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Basis of Presentation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Net revenues | $ 716,795 | $ 673,462 | $ 677,941 | $ 643,164 | $ 604,801 | $ 2,599,368 | $ 2,317,328
Costs of products sold | 511,495 | 496,086 | 487,794 | 469,327 | 443,052 | 1,896,259 | 1,743,506
Gross profit | 205,300 | 177,376 | 190,147 | 173,837 | 161,749 | 703,109 | 573,822
Operating Income | 104,062 | 76,006 | 95,416 | 85,005 | 67,578 | 324,005 | 197,058
Total other income (expense) | (12,043) | (8,981) | (9,228) | (9,296) | (17,136) | (44,641) | (102,842)
Income before taxes | 92,019 | 67,025 | 86,188 | 75,709 | 50,442 | 279,364 | 94,216
Income tax expense | 29,474 | 244,526 | 21,605 | 19,300 | 13,493 | 298,924 | 44,843
Net earnings (loss) | 62,545 | (177,501) | 64,583 | 56,409 | 36,949 | (19,560) | 49,373
Less: net earnings attributable to noncontrolling interests | 179 | 156 | 179 | 219 | 230 | 784 | 581
Net earnings (loss) attributable to Vishay stockholders | $ 62,366 | (177,657) | 64,404 | 56,190 | 36,719 | (20,344) | 48,792
Previously Reported [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Net revenues |  | 674,489 | 677,883 | 644,892 | 606,258 | 2,603,522 | 2,323,431
Costs of products sold |  | 497,988 | 488,610 | 471,929 | 445,383 | 1,903,910 | 1,753,648
Gross profit |  | 176,501 | 189,273 | 172,963 | 160,875 | 699,612 | 569,783
Operating Income |  | 72,536 | 92,328 | 82,036 | 64,688 | 311,588 | 101,717
Total other income (expense) |  | (5,511) | (6,140) | (6,327) | (14,246) | (32,224) | (7,501)
Income before taxes |  | 67,025 | 86,188 | 75,709 | 50,442 | 279,364 | 94,216
Income tax expense |  | 244,526 | 21,605 | 19,300 | 13,493 | 298,924 | 44,843
Net earnings (loss) |  | (177,501) | 64,583 | 56,409 | 36,949 | (19,560) | 49,373
Less: net earnings attributable to noncontrolling interests |  | 156 | 179 | 219 | 230 | 784 | 581
Net earnings (loss) attributable to Vishay stockholders |  | (177,657) | 64,404 | 56,190 | 36,719 | (20,344) | 48,792
Restatement Adjustment [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Net revenues |  | (1,027) | 58 | (1,728) | (1,457) | (4,154) | (6,103)
Costs of products sold |  | (1,902) | (816) | (2,602) | (2,331) | (7,651) | (10,142)
Gross profit |  | 875 | 874 | 874 | 874 | 3,497 | 4,039
Operating Income |  | 3,470 | 3,088 | 2,969 | 2,890 | 12,417 | 95,341
Total other income (expense) |  | (3,470) | (3,088) | (2,969) | (2,890) | (12,417) | (95,341)
Income before taxes |  | 0 | 0 | 0 | 0 | 0 | 0
Income tax expense |  | 0 | 0 | 0 | 0 | 0 | 0
Net earnings (loss) |  | 0 | 0 | 0 | 0 | 0 | 0
Less: net earnings attributable to noncontrolling interests |  | 0 | 0 | 0 | 0 | 0 | 0
Net earnings (loss) attributable to Vishay stockholders |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | 0
U.S. pension settlement charges |  |  |  |  |  |  | $ (79,321)

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