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Other Comprehensive Income (Loss) Other Comprehensive Income Balance Components (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Other Comprehensive Income (Loss), Tax [Abstract]    
Foreign currency translation adjustment $ (19,146) $ (2,187)
Unrealized loss on pension obligation (1,798) (1,733)
Unrealized gain on post-retirement benefit obligations 15,360 15,333
Unrealized loss on hedging instruments (6,565) 3,361
Accumulated other comprehensive income $ (12,149) $ 14,774