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Comprehensive Income - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Comprehensive Income        
Foreign currency translation adjustments $ (8,902) $ (8,596) $ (6,262) $ (6,783)
Pension liability, net of tax (11,498) (11,597) (17,857) (18,011)
Total accumulated other comprehensive loss $ (20,400) $ (20,193) $ (24,119) $ (24,794)