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Segment and Geographic Data, Revenue and assets by geographic area (Details) - USD ($) $ 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 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
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
Property and equipment, net | 865,296 |  |  |  | 898,095 |  |  |  | 865,296 | 898,095 |
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 560,973 | 590,145 | 591,082
Property and equipment, net | 94,512 |  |  |  | 116,807 |  |  |  | 94,512 | 116,807 |
Germany [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 719,246 | 821,005 | 800,733
Property and equipment, net | 122,817 |  |  |  | 124,850 |  |  |  | 122,817 | 124,850 |
Czech Republic [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net | 33,352 |  |  |  | 38,914 |  |  |  | 33,352 | 38,914 |
Other Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 88,553 | 107,598 | 89,348
Property and equipment, net | 85,566 |  |  |  | 94,377 |  |  |  | 85,566 | 94,377 |
Israel [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 12,597 | 13,871 | 13,319
Property and equipment, net | 107,715 |  |  |  | 121,691 |  |  |  | 107,715 | 121,691 |
Asia [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 919,119 | 960,663 | $ 876,497
People's Republic of China [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net | 182,411 |  |  |  | 176,671 |  |  |  | 182,411 | 176,671 |
Republic of China (Taiwan) [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net | 126,780 |  |  |  | 127,354 |  |  |  | 126,780 | 127,354 |
Other Asia [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net | 109,815 |  |  |  | 95,263 |  |  |  | 109,815 | 95,263 |
Other Geographic Area [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net | $ 2,328 |  |  |  | $ 2,168 |  |  |  | $ 2,328 | $ 2,168 |

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