Accumulated Other Comprehensive Income (Loss) - Changes in AOCI by Component (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period			$ 662,136
Total other comprehensive (loss) income, net	$ (255)	$ (2,996)	(22,241)	$ 4,119
Balance at end of period	690,204		690,204
Cumulative Translation Adjustment [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period			(46,198)	(54,257)
Other comprehensive loss before reclassifications			(19,622)	3,999
Amounts reclassified from AOCI			0	0
Total other comprehensive (loss) income, net			(19,622)	3,999
Balance at end of period	(65,820)	(50,258)	(65,820)	(50,258)
Unrealized (Loss) Gain on Derivatives [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period			476	(214)
Other comprehensive loss before reclassifications			(5,413)	625
Amounts reclassified from AOCI			5,454	(297)
Total other comprehensive (loss) income, net			41	328
Balance at end of period	517	114	517	114
Pension/OPEB Liability Adjustment [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period			(21,855)	(24,967)
Other comprehensive loss before reclassifications			(1,034)	17
Amounts reclassified from AOCI			489	413
Total other comprehensive (loss) income, net			(545)	430
Balance at end of period	(22,400)	(24,537)	(22,400)	(24,537)
Attributable to Unconsolidated Affiliates [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period			(1,193)	(354)
Other comprehensive loss before reclassifications			(903)	281
Amounts reclassified from AOCI			0	0
Total other comprehensive (loss) income, net			(903)	281
Balance at end of period	(2,096)	(73)	(2,096)	(73)
Total [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period	(90,165)	(72,881)	(68,770)	(79,792)
Other comprehensive loss before reclassifications			(26,972)	4,922
Amounts reclassified from AOCI			5,943	116
Total other comprehensive (loss) income, net	366	(1,873)	(21,029)	5,038
Balance at end of period	$ (89,799)	$ (74,754)	$ (89,799)	$ (74,754)