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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Changes in defined benefit pension plans, tax amount $ (328) $ (1,156) $ 2,557
Changes in other, tax amount $ (23) $ (77) $ (22)