Accumulated Other Comprehensive Income (Loss) - Changes in AOCI by Component (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period			$ 662,136
Total other comprehensive income (loss), net	$ 9,640	$ (5,563)	(12,601)	$ (1,444)
Balance at end of period	739,351		739,351
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			(11,254)	(2,199)
Amounts reclassified from AOCI			0	0
Total other comprehensive income (loss), net			(11,254)	(2,199)
Balance at end of period	(57,452)	(56,456)	(57,452)	(56,456)
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			(5,082)	763
Amounts reclassified from AOCI			5,274	(630)
Total other comprehensive income (loss), net			192	133
Balance at end of period	668	(81)	668	(81)
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			(1,468)	587
Amounts reclassified from AOCI			753	620
Total other comprehensive income (loss), net			(715)	1,207
Balance at end of period	(22,570)	(23,760)	(22,570)	(23,760)
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			(564)	828
Amounts reclassified from AOCI			0	0
Total other comprehensive income (loss), net			(564)	828
Balance at end of period	(1,757)	474	(1,757)	474
Total [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period	(89,799)	(74,754)	(68,770)	(79,792)
Other comprehensive loss before reclassifications			(18,368)	(21)
Amounts reclassified from AOCI			6,027	(10)
Total other comprehensive income (loss), net	8,688	(5,069)	(12,341)	(31)
Balance at end of period	$ (81,111)	$ (79,823)	$ (81,111)	$ (79,823)