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COMPREHENSIVE INCOME - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
COMPREHENSIVE INCOME      
Foreign currency translation adjustments $ (8,596) $ (6,783) $ (6,050)
Pension liability, net of tax (11,597) (18,011) (21,955)
Total accumulated other comprehensive loss $ (20,193) $ (24,794) $ (28,005)