Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 35,647	$ 53,546	$ 116,428	$ 131,900
Other comprehensive income (loss):
Pension and postemployment adjustment, net of tax	137	(115)	249	648
Foreign currency translation adjustments	(17,163)	(7,832)	(14,933)	(24,816)
Comprehensive income	$ 18,621	$ 45,599	$ 101,744	$ 107,732