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Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Tax on changes in defined benefit plans $ 421 $ 317 $ 1,170 $ 891