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Condensed Consolidated Statements of Comprehensive Income (Loss) Unaudited (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]    
OCI, Tax on foreign currency translation gains (losses) $ 0 $ 0
OCI, Tax on amortization of actuarial losses on retirement plans included in net periodic pension cost $ 686 $ 651