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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (benefit) $ 1,456 $ 176 $ 3,315 $ 2,443
Pension and other employee benefits 1,245 1,470 4,095 4,488
Net income 5,711 1,956 14,029 11,405
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income 16 13 52 26
Accumulated Other Comprehensive Income (Loss) | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Debt and Equity Securities, Realized Gain (Loss) 0 0 0 (19)
Income tax expense (benefit) 0 0 0 5
Net income 0 0 0 (14)
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 77 72 231 218
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]        
Income tax expense (benefit) (6) (4) (14) (13)
Net income $ 16 $ 13 $ 52 $ 40