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Classification within AOCL on the Condenced Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]            
Foreign currency translation $ 1,444   $ 1,500      
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax (10,390)   (10,729)      
Postretirement medical plans 1,484   1,960      
Accumulated other comprehensive loss $ (7,462) $ (7,415) $ (7,269) $ (9,219) $ (9,329) $ (9,648)