Accumulated Other Comprehensive Income (Loss), Changes in AOCI by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance	$ 827,285
Other comprehensive income (loss) before reclassifications	(14,696)	$ (17,584)
Amounts reclassified from AOCI	2,730	5,517
Ending balance	898,684	827,285
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance	(54,990)	(42,923)
Ending balance	(66,956)	(54,990)
Cumulative Translation Adjustment [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance	(24,773)	(7,076)
Other comprehensive income (loss) before reclassifications	(25,192)	(17,697)
Amounts reclassified from AOCI	0	0
Ending balance	(49,965)	(24,773)
Unrealized (Losses)/ Gains on Derivatives [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance	(2,009)	(953)
Other comprehensive income (loss) before reclassifications	400	(4,604)
Amounts reclassified from AOCI	1,309	3,548
Ending balance	(300)	(2,009)
Minimum Pension/OPEB Liability Adjustment [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance	(28,429)	(35,164)
Other comprehensive income (loss) before reclassifications	3,962	4,766
Amounts reclassified from AOCI	1,421	1,969
Ending balance	(23,046)	(28,429)
Unrealized Gains on Equity Investments [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance	221	270
Other comprehensive income (loss) before reclassifications	159	(49)
Amounts reclassified from AOCI	0	0
Ending balance	380	221
Attributable to Unconsolidated Affiliates [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance	0	0
Other comprehensive income (loss) before reclassifications	5,975	0
Amounts reclassified from AOCI	0	0
Ending balance	$ 5,975	$ 0