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Comprehensive Income - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Comprehensive Income        
Foreign currency translation adjustments $ (9,413) $ (8,596) $ (9,181) $ (6,783)
Pension liability, net of tax (11,322) (11,597) (17,525) (18,011)
Total accumulated other comprehensive loss $ (20,735) $ (20,193) $ (26,706) $ (24,794)