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Comprehensive Income (Loss) - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Comprehensive Income (Loss)    
Foreign currency translation adjustments $ (6,017) $ (6,050)
Pension liability, net of tax (21,590) (21,955)
Total accumulated other comprehensive loss $ (27,607) $ (28,005)