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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Details about Accumulated Other Comprehensive Income Components (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Tax effect $ (1,700) $ (1,456) $ (5,558) $ (3,315)
Net income 6,646 5,711 19,971 14,029
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income 1 16 2 52
Prior service costs | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Pension and other employee benefits (55) (55) (165) (165)
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Pension and other employee benefits 57 77 169 231
Accumulated Defined Benefit Plans Adjustment Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Tax effect (1) (6) (2) (14)
Net income $ 1 $ 16 $ 2 $ 52