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