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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, 2011 | Oct. 01, 2011 | Jul. 02, 2011 | Apr. 02, 2011 | Dec. 31, 2010 | Oct. 02, 2010 | Jul. 04, 2010 | Apr. 03, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Statement of Operations data: |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 551,391 | $ 637,649 | $ 709,838 | $ 695,151 | $ 688,612 | $ 694,365 | $ 701,655 | $ 640,460 | $ 2,594,029 | $ 2,725,092 | $ 2,042,033
Gross profit | 125,656 | 167,477 | 212,190 | 214,663 | 211,501 | 218,378 | 210,593 | 167,013 | 719,986 | 807,485 | 388,161
Operating Income | 33,565 | 75,333 | 115,505 | 122,198 | 120,583 | 130,903 | 101,327 | 65,125 | 346,601 | 417,938 | (39,185)
Net earnings (loss) | 31,202 | 50,692 | 82,496 | 75,607 | 147,537 | 90,152 | 76,965 | 45,639 | 239,997 | 360,293 | (56,515)
Net earnings (loss) attributable to noncontrolling interests | 250 | 205 | 401 | 320 | 309 | 353 | 306 | 219 | 1,176 | 1,187 | 673
Net earnings (loss) attributable to Vishay stockholders | 30,952 | 50,487 | 82,095 | 75,287 | 147,228 | 89,799 | 76,659 | 45,420 | 238,821 | 359,106 | (57,188)
Per Share data: |  |  |  |  |  |  |  |  |  |  |
Basic earnings (loss) per share attributable to Vishay stockholders (in dollars per share) | $ 0.20 | $ 0.32 | $ 0.51 | $ 0.46 | $ 0.84 | $ 0.48 | $ 0.41 | $ 0.24 | $ 1.49 | $ 1.96 | $ (0.31)
Diluted earnings (loss) per share attributable to Vishay stockholders (in dollars per share) | $ 0.19 | $ 0.31 | $ 0.48 | $ 0.43 | $ 0.81 | $ 0.47 | $ 0.40 | $ 0.24 | $ 1.42 | $ 1.89 | $ (0.31)
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |
Executive employment agreement charge | 0 |  |  | 0 | 0 | 0 | 0 | 0 | 5,762 | 0 | 57,824
One time tax benefit (expense) | $ 6,538 | $ 0 | $ 0 | $ (10,024) | $ 59,484 | $ 0 | $ 0 | $ 0 | $ 10,206 | $ (27,635) | $ (6,911)
Quarter end date | Dec. 31, 2011 | Oct. 01, 2011 | Jul. 02, 2011 | Apr. 02, 2011 | Dec. 31, 2010 | Oct. 02, 2010 | Jul. 03, 2010 | Apr. 03, 2010 | Dec. 31, 2011 |  |
Number of weeks in an interim reporting period |  |  |  |  |  |  |  |  | 13 | 13 |

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