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Condensed Consolidated Statements of Comprehensive Income (Loss) Unaudited (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 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 $ 650 $ 661 $ 1,301 $ 1,351