Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 45,114	$ (19,208)	$ 61,374	$ (13,699)
Components of other comprehensive income:
Translation adjustment	2,619	(1,547)	2,753	(755)
Net change in derivatives (Note 12)	(1,602)	2,267	(2,540)	1,550
Net gain (loss) on long-term pension liability obligation	16	0	(33)	0
Income taxes	(5)	(626)	(5)	(436)
Total other comprehensive income (loss)	1,028	94	175	359
Total comprehensive income (loss)	46,142	(19,114)	61,549	(13,340)
Comprehensive income (loss) attributable to noncontrolling interests and redeemable noncontrolling interests	(488)	4,191	1,199	30,417
Comprehensive income (loss) attributable to stockholders	$ 45,654	$ (14,923)	$ 62,748	$ 17,077