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Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (314,986) $ (283,529) $ (302,414) $ (265,406)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 1,170 6,523    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (19,177) (32,955)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 5,435 8,309    
Other Comprehensive Income (Loss), Net of Tax (12,572) (18,123)    
Accumulated Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (85,767) (63,546) (63,913) (31,340)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 0    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (21,854) (32,206)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0    
Other Comprehensive Income (Loss), Net of Tax (21,854) (32,206)    
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (1,714) 2,914 702 (1,081)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 1,170 6,523    
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 (3,586) (2,528)    
Other Comprehensive Income (Loss), Net of Tax (2,416) 3,995    
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (227,505) (222,897) $ (239,203) $ (232,985)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 0    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 2,677 (749)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 9,021 10,837    
Other Comprehensive Income (Loss), Net of Tax $ 11,698 $ 10,088