Other Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2015	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Income (Expense) [Abstract]
Foreign exchange gain (loss)									$ 292	$ 3,180	$ (1,115)
Interest income									4,264	4,397	4,939
Other									160	399	(1,335)
Other Income (expense)									4,716	7,976	2,489
Insurance proceeds received									13,406
Insurance proceeds classified as investing activities									4,911
Loss related to Tianjin explosion	$ 8,809	$ 0	$ 0	$ 0	$ 0	$ (5,350)	$ 0	$ 0	$ (8,809)	$ 5,350	$ 0