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Condensed Consolidated Statements of Comprehensive Income (Loss) Unaudited (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]        
OCI, Tax on foreign currency translation gains (losses) $ 0 $ 0 $ 0 $ 0
OCI, Tax on amortization of actuarial losses on retirement plans included in net periodic pension cost $ 676 $ 673 $ 1,977 $ 2,024