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COMPREHENSIVE INCOME - Changes in accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
COMPREHENSIVE INCOME    
Foreign Currency Translation Adjustments, Beginning balance $ (6,783) $ (6,050)
Foreign Currency Translation Adjustments, Other comprehensive income (loss) before reclassifications (1,813) (733)
Foreign Currency Translation Adjustments, Net current period other comprehensive (loss) income (1,813) (733)
Foreign Currency Translation Adjustments, Ending balance (8,596) (6,783)
Defined Benefit Pension Items, Beginning balance (18,011) (21,955)
Defined Benefit Pension Items, Other comprehensive (loss) income before reclassifications 5,767 3,196
Defined Benefit Pension Items, Amounts reclassified from accumulated other comprehensive loss 647 748
Defined Benefit Pension Items, Net current period other comprehensive (loss) income 6,414 3,944
Defined Benefit Pension Items, Ending balance (11,597) (18,011)
Beginning balance (24,794) (28,005)
Other comprehensive income (loss) before reclassifications 3,954 2,463
Amounts reclassified from accumulated other comprehensive loss 647 748
Net current period other comprehensive (loss) income 4,601 3,211
Ending balance $ (20,193) $ (24,794)