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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Details about Accumulated Other Comprehensive Income Components (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Tax effect $ (2,075) $ (1,357) $ (3,858) $ (1,859)
Net income 6,795 5,827 13,325 8,318
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income 1 15 1 36
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) (110) (110)
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 77 112 154
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) (7) (1) (8)
Net income $ 1 $ 15 $ 1 $ 36