Other Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Loss on disposal of equity affiliate	$ (948)	$ 0	$ 0	$ 7,060	$ 0	$ 0	$ 0	$ 0	$ 6,112	$ 0	$ 0
Amounts reclassified out of AOCI, net of tax									6,222	94,509	7,923
Foreign exchange gain (loss)									(4,536)	292	3,180
Interest income									6,482	4,264	4,397
Other									(208)	160	399
Other Income (expense)									1,738	4,716	7,976
Insurance proceeds received										13,406
Insurance proceeds classified as investing activities										4,911
Loss related to Tianjin explosion	$ 0	$ 0	$ 0	$ 0	$ (8,809)	$ 0	$ 0	$ 0	0	$ (8,809)	$ 5,350
Equity affiliate [Member]
Schedule of Equity Method Investments [Line Items]
Amounts reclassified out of AOCI, net of tax									$ 1,110