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Comprehensive Income - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Comprehensive Income        
Foreign currency translation adjustments $ (6,262) $ (6,783) $ (6,193) $ (6,050)
Pension liability, net of tax (17,857) (18,011) (21,772) (21,955)
Total accumulated other comprehensive loss $ (24,119) $ (24,794) $ (27,965) $ (28,005)