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Comprehensive Income (Loss) - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Comprehensive Income (Loss)      
Foreign currency translation adjustments $ (6,783) $ (6,050) $ (7,033)
Pension liability, net of tax (18,011) (21,955) (17,503)
Total accumulated other comprehensive loss $ (24,794) $ (28,005) $ (24,536)