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Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (283,529) $ (277,637) $ (265,406) $ (354,998)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 6,523 (578)    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (32,955) 66,393    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 8,309 11,546    
Other Comprehensive Income (Loss), Net of Tax (18,123) 77,361    
Accumulated Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (63,546) (36,875) (31,340) (115,322)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 0    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (32,206) 78,447    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0    
Other Comprehensive Income (Loss), Net of Tax (32,206) 78,447    
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,914 (2,445) (1,081) (2,232)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 6,523 (578)    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 0 0    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (2,528) 365    
Other Comprehensive Income (Loss), Net of Tax 3,995 (213)    
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (222,897) (238,317) $ (232,985) $ (237,444)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 0    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (749) (12,054)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 10,837 11,181    
Other Comprehensive Income (Loss), Net of Tax $ 10,088 $ (873)