Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 18,398	$ 110,074	$ 16,260	$ 5,509
Components of other comprehensive income:
Translation adjustment	909	811	134	790
Net change in derivatives (Note 12)	(2,626)	(900)	(938)	(715)
Net loss on long-term pension liability obligation	0	0	(49)	0
Income taxes	141	255	0	190
Total other comprehensive income (loss)	(1,576)	166	(853)	265
Total comprehensive income	16,822	110,240	15,407	5,774
Comprehensive income attributable to noncontrolling interests and redeemable noncontrolling interests	980	11,385	1,687	26,226
Comprehensive income attributable to stockholders	$ 17,802	$ 121,625	$ 17,094	$ 32,000