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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax expense (benefit) | $ 1,357 | $ 1,233 | $ 1,859 | $ 2,267
Pension and other employee benefits | 1,334 | 1,473 | 2,850 | 3,018
Net income | 5,827 | 4,981 | 8,318 | 9,449
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income | 15 | 0 | 36 | 13
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 | (19) | 0 | (19)
Income tax expense (benefit) | 0 | 5 | 0 | 5
Net income | 0 | (14) | 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) | (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 | 77 | 73 | 154 | 146
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) | (7) | (4) | (8) | (9)
Net income | $ 15 | $ 14 | $ 36 | $ 27

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