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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, 2015 | Oct. 03, 2015 | Jul. 04, 2015 | Apr. 04, 2015 | Dec. 31, 2014 | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Sep. 28, 2013 | Mar. 30, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Statement of Operations data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 555,928 |  | $ 560,654 |  | $ 590,470 |  | $ 593,436 |  | $ 610,764 |  | $ 638,211 |  | $ 641,929 |  | $ 602,378 |  |  |  | $ 2,300,488 | $ 2,493,282 | $ 2,370,979
Gross profit | 125,556 |  | 130,144 |  | 141,482 |  | 145,038 |  | 143,524 |  | 158,392 |  | 164,093 |  | 145,283 |  |  |  | 542,220 | 611,292 | 567,260
Operating Income | 30,226 |  | (24,155) |  | 44,170 |  | 47,558 |  | 43,157 |  | 45,459 |  | 57,923 |  | 42,572 |  |  |  | 97,799 | 189,111 | 197,682
Net earnings (loss) | (137,626) |  | (27,550) |  | 26,518 |  | 30,925 |  | 29,070 |  | 26,977 |  | 35,832 |  | 25,964 |  |  |  | (107,733) | 117,843 | 123,769
Net earnings (loss) attributable to noncontrolling interests | 189 |  | 116 |  | 250 |  | 226 |  | (136) |  | 6 |  | 190 |  | 154 |  |  |  | 781 | 214 | 789
Net earnings (loss) attributable to Vishay stockholders | $ (137,815) |  | $ (27,666) |  | $ 26,268 |  | $ 30,699 |  | $ 29,206 |  | $ 26,971 |  | $ 35,642 |  | $ 25,810 |  |  |  | $ (108,514) | $ 117,629 | $ 122,980
Per Share data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings (loss) per share attributable to Vishay stockholders: | $ (0.93) | [1] | $ (0.19) | [1] | $ 0.18 | [1] | $ 0.21 | [1] | $ 0.20 | [1] | $ 0.18 | [1] | $ 0.24 | [1] | $ 0.17 | [1] |  |  | $ (0.73) | $ 0.80 | $ 0.85
Diluted earnings (loss) per share attributable to Vishay stockholders: | $ (0.93) | [1] | $ (0.19) | [1] | $ 0.17 | [1] | $ 0.20 | [1] | $ 0.19 | [1] | $ 0.17 | [1] | $ 0.23 | [1] | $ 0.17 | [1] |  |  | $ (0.73) | $ 0.77 | $ 0.81
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses | $ 9,821 |  | $ 2,324 |  | $ 5,660 |  | $ 1,410 |  | $ 1,971 |  | $ 3,508 |  | $ 9,014 |  | $ 6,404 |  |  |  | $ 19,215 | $ 20,897 | $ 2,814
Impairment of goodwill and long-lived assets | 0 |  | 62,980 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  | 62,980 | 0 | 0
U.S. pension settlement charges | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 15,588 |  | 0 |  | 0 |  |  |  | 0 | 15,588 | 0
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss related to Tianjin explosion | 0 |  | 5,350 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  | 5,350 | 0 | 0
Discrete Tax Items Included Income Tax Expense | $ 152,437 |  | $ 0 |  | $ 0 |  | $ 0 |  | $ (1,228) |  | $ 0 |  | $ 0 |  | $ 0 |  | $ (2,867) | $ (1,330) | $ 152,437 | $ (1,228) | $ (4,197)
Quarter end date | Dec. 31, 2015 | [2] | Oct. 03, 2015 | [2] | Jul. 04, 2015 | [2] | Apr. 04, 2015 | [2] | Dec. 31, 2014 | [2] | Sep. 27, 2014 | [2] | Jun. 28, 2014 | [2] | Mar. 29, 2014 | [2] |  |  | Dec. 31, 2015 |  |
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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