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Summary of Quarterly Financial Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 29, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Oct. 01, 2011 | Jul. 02, 2011 | Apr. 02, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Statement of Operations data: |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 530,570 | $ 572,781 | $ 588,199 | $ 538,547 | $ 551,391 | $ 637,649 | $ 709,838 | $ 695,151 | $ 2,230,097 | $ 2,594,029 | $ 2,725,092
Gross profit | 108,791 | 133,554 | 147,619 | 136,709 | 125,656 | 167,477 | 212,190 | 214,663 | 526,673 | 719,986 | 807,485
Operating Income | 21,514 | 44,459 | 72,883 | 50,345 | 33,565 | 75,333 | 115,505 | 122,198 | 189,201 | 346,601 | 417,938
Net earnings | 21,137 | 22,489 | 45,830 | 34,075 | 31,202 | 50,692 | 82,496 | 75,607 | 123,531 | 239,997 | 360,293
Net earnings (loss) attributable to noncontrolling interests | 162 | 209 | 159 | 263 | 250 | 205 | 401 | 320 | 793 | 1,176 | 1,187
Net earnings (loss) attributable to Vishay stockholders | 20,975 | 22,280 | 45,671 | 33,812 | 30,952 | 50,487 | 82,095 | 75,287 | 122,738 | 238,821 | 359,106
Per Share data: |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share attributable to Vishay stockholders: | $ 0.15 | $ 0.16 | $ 0.30 | $ 0.22 | $ 0.20 | $ 0.32 | $ 0.51 | $ 0.46 | $ 0.82 | $ 1.49 | $ 1.96
Diluted earnings per share attributable to Vishay stockholders: | $ 0.14 | $ 0.15 | $ 0.29 | $ 0.21 | $ 0.19 | $ 0.31 | $ 0.48 | $ 0.43 | $ 0.79 | $ 1.42 | $ 1.89
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Property | 0 | 0 | 12,153 | 0 | 0 | 0 | 0 | 0 | 12,153 | 0 | 0
Executive employment agreement charge | 0 | 0 | 0 | 0 | 0 | (1,873) | (3,889) | 0 | 0 | 5,762 | 0
One time tax benefit (expense) | $ 4,036 | $ 0 | $ 0 | $ 0 | $ 6,538 | $ 0 | $ 0 | $ (10,024) | $ 1,969 | $ 10,206 | $ (27,635)
Quarter end date | Dec. 31, 2012 | Sep. 29, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Oct. 01, 2011 | Jul. 02, 2011 | Apr. 02, 2011 | Dec. 31, 2012 |  |
Number of weeks in an interim reporting period |  |  |  |  |  |  |  |  | 13 |  |

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