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Other Comprehensive Income (Loss) Other Comprehensive Income Balance Components (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Other Comprehensive Income (Loss), Tax [Abstract]    
Foreign currency translation adjustment $ (9,360) $ (12,676)
Unrealized loss on pension obligation (1,404) (1,404)
Unrealized gain on post-retirement benefit obligations 20,358 20,358
Unrealized loss on hedging instruments 7,623 7,345
Accumulated other comprehensive income $ 17,217 $ 13,623