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Classification within AOCL on the Condensed Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Foreign currency translation $ 1,514 $ 1,413
Derivative instruments designated as cash flow hedges (11,068) (11,181)
Postretirement medical plans 120 120
Accumulated other comprehensive loss $ (9,434) $ (9,648)