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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

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