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Accumulated Other Comprehensive Income (Loss) - Changes by Component (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Changes in accumulated other comprehensive income [Roll Forward]          
Beginning balance   $ 536,028   $ 536,028  
Total other comprehensive (loss) income, net $ (10,516)   $ 1,773 (7,453) $ 7,337
Reclassification of stranded effects of the Act   556      
Ending balance 572,089     572,089  
Total [Member]          
Changes in accumulated other comprehensive income [Roll Forward]          
Beginning balance   (51,056)   (51,056) (66,956)
Other comprehensive (loss) income before reclassifications       (7,472) 9,193
Amounts reclassified from AOCI       (129) (2,691)
Total other comprehensive (loss) income, net       (7,601) 6,502
Reclassification of stranded effects of the Act       556  
Ending balance (58,101)   (60,454) (58,101) (60,454)
Cumulative Translation Adjustment [Member]          
Changes in accumulated other comprehensive income [Roll Forward]          
Beginning balance   (38,163)   (38,163) (49,965)
Other comprehensive (loss) income before reclassifications       (6,793) 11,058
Amounts reclassified from AOCI       0 (3,777)
Total other comprehensive (loss) income, net       (6,793) 7,281
Reclassification of stranded effects of the Act       0  
Ending balance (44,956)   (42,684) (44,956) (42,684)
Unrealized (Loss) Gain on Derivatives [Member]          
Changes in accumulated other comprehensive income [Roll Forward]          
Beginning balance   847   847 (300)
Other comprehensive (loss) income before reclassifications       (752) (657)
Amounts reclassified from AOCI       (275) 974
Total other comprehensive (loss) income, net       (1,027) 317
Reclassification of stranded effects of the Act       112  
Ending balance (68)   17 (68) 17
Pension/OPEB Liability Adjustment [Member]          
Changes in accumulated other comprehensive income [Roll Forward]          
Beginning balance   (20,610)   (20,610) (23,046)
Other comprehensive (loss) income before reclassifications       353 (856)
Amounts reclassified from AOCI       146 491
Total other comprehensive (loss) income, net       499 (365)
Reclassification of stranded effects of the Act       (1,018)  
Ending balance (21,129)   (23,411) (21,129) (23,411)
Unrealized Gain (Loss) on Equity Securities [Member]          
Changes in accumulated other comprehensive income [Roll Forward]          
Beginning balance   0   0 380
Other comprehensive (loss) income before reclassifications       0 (1)
Amounts reclassified from AOCI       0 (379)
Total other comprehensive (loss) income, net       0 (380)
Reclassification of stranded effects of the Act       0  
Ending balance 0   0 0 0
Attributable to Unconsolidated Affiliates [Member]          
Changes in accumulated other comprehensive income [Roll Forward]          
Beginning balance   $ 6,870   6,870 5,975
Other comprehensive (loss) income before reclassifications       (280) (351)
Amounts reclassified from AOCI       0 0
Total other comprehensive (loss) income, net       (280) (351)
Reclassification of stranded effects of the Act       1,462  
Ending balance $ 8,052   $ 5,624 $ 8,052 $ 5,624