Segment and Geographic Data, Revenue and assets by geographic area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 609,577	$ 628,329	$ 685,240	$ 745,159	$ 775,892	$ 780,972	$ 761,030	$ 716,795	$ 2,668,305	$ 3,034,689	$ 2,599,368
Property and equipment, net	951,525				969,001				951,525	969,001
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues									686,985	743,647	590,839
Property and equipment, net	100,163				117,138				100,163	117,138
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues									910,509	982,082	837,258
Property and equipment, net	179,218				169,941				179,218	169,941
Other Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues									113,473	123,846	99,636
Property and equipment, net	116,883				121,964				116,883	121,964
Israel [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues									17,787	13,299	11,075
Property and equipment, net	92,636				103,675				92,636	103,675
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues									939,551	1,171,815	$ 1,060,560
People's Republic of China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	215,139				217,681				215,139	217,681
Republic of China (Taiwan) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	161,374				145,644				161,374	145,644
Other Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	81,338				88,864				81,338	88,864
Other Geographic Area [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 4,774				$ 4,094				$ 4,774	$ 4,094