Accumulated Other Comprehensive Income (Loss) - Changes in AOCI by Component (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period			$ 563,260
Total other comprehensive loss, net	$ (5,563)	$ (5,395)	(1,444)	$ (12,848)
Balance at end of period	624,596		624,596
Cumulative Translation Adjustment [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period			(54,257)	(38,163)
Other comprehensive (loss) income before reclassifications			(2,199)	(5,143)
Amounts reclassified from AOCI			0	0
Total other comprehensive loss, net			(2,199)	(5,143)
Reclassification of stranded effects of the Act				0
Balance at end of period	(56,456)	(43,306)	(56,456)	(43,306)
Unrealized (Loss) Gain on Derivatives [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period			(214)	847
Other comprehensive (loss) income before reclassifications			763	(441)
Amounts reclassified from AOCI			(630)	(455)
Total other comprehensive loss, net			133	(896)
Reclassification of stranded effects of the Act				112
Balance at end of period	(81)	63	(81)	63
Pension/OPEB Liability Adjustment [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period			(24,967)	(20,610)
Other comprehensive (loss) income before reclassifications			587	551
Amounts reclassified from AOCI			620	218
Total other comprehensive loss, net			1,207	769
Reclassification of stranded effects of the Act				(1,018)
Balance at end of period	(23,760)	(20,859)	(23,760)	(20,859)
Attributable to Unconsolidated Affiliates [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period			(354)	6,870
Other comprehensive (loss) income before reclassifications			828	(7,187)
Amounts reclassified from AOCI			0	0
Total other comprehensive loss, net			828	(7,187)
Reclassification of stranded effects of the Act				1,462
Balance at end of period	474	1,145	474	1,145
Total [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period	(74,754)	(58,101)	(79,792)	(51,056)
Other comprehensive (loss) income before reclassifications			(21)	(12,220)
Amounts reclassified from AOCI			(10)	(237)
Total other comprehensive loss, net	(5,069)	(4,856)	(31)	(12,457)
Reclassification of stranded effects of the Act				556
Balance at end of period	$ (79,823)	$ (62,957)	$ (79,823)	$ (62,957)