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Comprehensive Income - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Comprehensive Income        
Foreign currency translation adjustments $ (8,640) $ (8,596) $ (7,497) $ (6,783)
Pension liability, net of tax (11,414) (11,597) (17,687) (18,011)
Total accumulated other comprehensive loss $ (20,054) $ (20,193) $ (25,184) $ (24,794)