Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2020	Sep. 27, 2019	Sep. 25, 2020	Sep. 27, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 6,496	$ 3,463	$ 10,071	$ 35,909
Other comprehensive income (loss):
Foreign currency translation adjustment	3,076	(463)	3,369	(627)
Derivative and hedging activity, net of tax	(315)	82	(822)	9
Pension and post-employment benefit adjustment, net of tax	29	501	134	14,994
Net current period other comprehensive (loss) income after tax	2,790	120	2,681	14,376
Comprehensive income	$ 9,286	$ 3,583	$ 12,752	$ 50,285