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Summary of Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Operations data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 674,489 |  | $ 677,883 |  | $ 644,892 |  | $ 606,258 |  | $ 570,819 |  | $ 591,955 |  | $ 590,051 |  | $ 570,606 |  |  | $ 2,603,522 | $ 2,323,431 | $ 2,300,488
Gross profit | 176,501 |  | 189,273 |  | 172,963 |  | 160,875 |  | 132,445 |  | 153,901 |  | 146,128 |  | 137,309 |  |  | 699,612 | 569,783 | 542,220
Operating Income | 72,536 |  | 92,328 |  | 82,036 |  | 64,688 |  | (45,468) |  | 57,229 |  | 49,408 |  | 40,548 |  |  | 311,588 | 101,717 | 97,799
Net earnings (loss) | (177,501) |  | 64,583 |  | 56,409 |  | 36,949 |  | (48,604) |  | 36,596 |  | 33,229 |  | 28,152 |  |  | (19,560) | 49,373 | (107,733)
Net earnings (loss) attributable to noncontrolling interests | 156 |  | 179 |  | 219 |  | 230 |  | 144 |  | 156 |  | 143 |  | 138 |  |  | 784 | 581 | 781
Net earnings (loss) attributable to Vishay stockholders | $ (177,657) |  | $ 64,404 |  | $ 56,190 |  | $ 36,719 |  | $ (48,748) |  | $ 36,440 |  | $ 33,086 |  | $ 28,014 |  |  | $ (20,344) | $ 48,792 | $ (108,514)
Per Share data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings (loss) per share attributable to Vishay stockholders: | $ (1.23) | [1] | $ 0.44 | [1] | $ 0.38 | [1] | $ 0.25 | [1] | $ (0.33) | [1] | $ 0.25 | [1] | $ 0.22 | [1] | $ 0.19 | [1] |  | $ (0.14) | $ 0.33 | $ (0.73)
Diluted earnings (loss) per share attributable to Vishay stockholders: | $ (1.23) | [1] | $ 0.41 | [1] | $ 0.36 | [1] | $ 0.24 | [1] | $ (0.33) | [1] | $ 0.24 | [1] | $ 0.22 | [1] | $ 0.19 | [1] |  | $ (0.14) | $ 0.32 | $ (0.73)
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses | $ 6,079 |  | $ 3,244 |  | $ 481 |  | $ 1,469 |  | $ 7,060 |  | $ 1,197 |  | $ 4,467 |  | $ 6,475 |  |  | $ 11,273 | $ 19,199 | $ 19,215
Impairment of Intangible Assets | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 1,559 |  | 0 |  | 0 |  |  | 0 | 1,559 | 57,600
U.S. pension settlement charges | 0 |  | 0 |  | 0 |  | 0 |  | 79,321 |  | 0 |  | 0 |  | 0 |  |  | 0 | 79,321 | 0
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on disposal of equity affiliate | 948 |  | 0 |  | 0 |  | (7,060) |  | 0 |  | 0 |  | 0 |  | 0 |  |  | (6,112) | 0 | 0
Gain on early extinguishment of debt | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 986 |  | 3,611 |  |  | 0 | 4,597 | 0
Gain (loss) related to Tianjin explosion | 0 |  | 0 |  | 0 |  | 0 |  | 8,809 |  | 0 |  | 0 |  | 0 |  |  | 0 | 8,809 | (5,350)
Income Tax Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total tax expense enactment of TCJA | 234,855 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  |  | 234,855 |  |
Discrete Tax Items Repatriation | (2,702) |  | (892) |  | (1,240) |  | (968) |  | (165) |  | (1,402) |  | (1,217) |  | (769) |  | $ 163,954 | 5,802 |  |
Discrete Tax Items - Pension Settlement | 0 |  | 0 |  | 0 |  | 0 |  | 34,853 |  | 0 |  | 0 |  | 0 |  |  | 0 | 34,853 | 0
Tax effects of changes in uncertain tax positions | $ 2,369 |  | $ (804) |  | $ 0 |  | $ 0 |  | $ (8,704) |  | $ 0 |  | $ 0 |  | $ 0 |  |  | $ (1,565) | $ (8,704) | $ (2,629)
Quarter end date | Dec. 31, 2017 | [2] | Sep. 30, 2017 | [2] | Jul. 01, 2017 | [2] | Apr. 01, 2017 | [2] | Dec. 31, 2016 | [2] | Oct. 01, 2016 | [2] | Jul. 02, 2016 | [2] | Apr. 02, 2016 | [2] |  | Dec. 31, 2017 |  |
Number of weeks in an interim reporting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | P91D |  |
[1] | May not add due to differences in weighted average share counts.
[2] | 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.

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