Accumulated Other Comprehensive Income - Changes by Component (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance			$ 936,437
Total other comprehensive income (loss), net	$ 1,773	$ (6,509)	7,337	$ (5,840)
Ending balance	506,006		506,006
Total [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance			(66,956)	(54,990)
Other comprehensive income (loss) before reclassifications			9,193	(4,111)
Amounts reclassified from AOCI			(2,691)	(371)
Total other comprehensive income (loss), net			6,502	(4,482)
Ending balance	(60,454)	(59,472)	(60,454)	(59,472)
Cumulative Translation Adjustment [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance			(49,965)	(24,773)
Other comprehensive income (loss) before reclassifications			11,058	(9,939)
Amounts reclassified from AOCI			(3,777)	0
Total other comprehensive income (loss), net			7,281	(9,939)
Ending balance	(42,684)	(34,712)	(42,684)	(34,712)
Unrealized (Loss) Gain on Derivatives [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance			(300)	(2,009)
Other comprehensive income (loss) before reclassifications			(657)	2,457
Amounts reclassified from AOCI			974	(1,163)
Total other comprehensive income (loss), net			317	1,294
Ending balance	17	(715)	17	(715)
Minimum Pension/OPEB Liability Adjustment [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance			(23,046)	(28,429)
Other comprehensive income (loss) before reclassifications			(856)	1,910
Amounts reclassified from AOCI			491	792
Total other comprehensive income (loss), net			(365)	2,702
Ending balance	(23,411)	(25,727)	(23,411)	(25,727)
Unrealized Gain (Loss) on Equity Securities [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance			380	221
Other comprehensive income (loss) before reclassifications			(1)	23
Amounts reclassified from AOCI			(379)	0
Total other comprehensive income (loss), net			(380)	23
Ending balance	0	244	0	244
Attributable to Unconsolidated Affiliates [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance			5,975	0
Other comprehensive income (loss) before reclassifications			(351)	1,438
Amounts reclassified from AOCI			0	0
Total other comprehensive income (loss), net			(351)	1,438
Ending balance	$ 5,624	$ 1,438	$ 5,624	$ 1,438