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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ (747,445) $ (685,145)
Amortization 14,186 13,539
Other current period change (48,896) (78,414)
Ending balance (712,735) (620,270)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (173,894) (109,180)
Other current period change (37,874) (73,093)
Ending balance (136,020) (36,087)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (568,436) (576,657)
Amortization 14,052 14,605
Other current period change (5,495) (5,321)
Ending balance (576,993) (585,941)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (5,115) 692
Amortization 134 (1,066)
Other current period change (5,527) 0
Ending balance $ 278 $ 1,758