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Other Comprehensive Income Other Comprehensive Income (Balance Sheet Components) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Other Comprehensive Income (Loss), Tax [Abstract]    
Foreign currency translation adjustment $ (3,902) $ (2,187)
Unrealized loss on pension obligation (1,798) (1,733)
Unrealized gain on post-retirement benefit obligations 15,359 15,333
Unrealized loss on hedging instruments 443 3,361
Accumulated other comprehensive income $ 10,102 $ 14,774