Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 10,564	$ 3,050
Other comprehensive income (loss):
Foreign currency translation adjustment	1,113	1,103
Derivative and hedging activity, net of tax	(675)	(461)
Pension and post-employment benefit adjustment, net of tax	1,278	757
Net current period other comprehensive income (loss) after tax	1,716	1,399
Comprehensive income	$ 12,280	$ 4,449