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ACCUMULATED OTHER COMPREHENSIVE LOSS - Details about Accumulated Other Comprehensive Income Components (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Income tax expense (benefit) | $ 502 | $ 1,034
Pension and other employee benefits | 1,516 | 1,545
Net income | 2,491 | 4,468
Reclassification out of Accumulated Other Comprehensive Income |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net income | 21 | 13
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)
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
Defined Benefit and Other Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Income tax expense (benefit) | (1) | (5)
Net income | $ 21 | $ 13

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