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Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (277,637) $ (266,403) $ (354,998) $ (266,649)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (578) (8,305)    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 66,393 (2,126)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 11,546 10,677    
Other Comprehensive Income (Loss), Net of Tax 77,361 246    
Accumulated Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (36,875) (57,232) (115,322) (57,394)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 0    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 78,447 162    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0    
Other Comprehensive Income (Loss), Net of Tax 78,447 162    
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (2,445) (4,082) (2,232) 3,016
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (578) (3,760)    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 0 (217)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 365 (3,121)    
Other Comprehensive Income (Loss), Net of Tax (213) (7,098)    
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (238,317) (205,089) $ (237,444) $ (212,271)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 (4,545)    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (12,054) (2,071)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 11,181 13,798    
Other Comprehensive Income (Loss), Net of Tax $ (873) $ 7,182