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ACCUMULATED OTHER COMPREHENSIVE LOSS - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Income tax expense | $ 1,034 | $ 1,061
Other components of net periodic pension and postretirement benefits | (141) | (408)
Net income | (4,468) | (4,439)
Reclassification out of Accumulated Other Comprehensive Income |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Net income | 13 | 13
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 | (5) | (5)
Prior Service Costs | Reclassification out of Accumulated Other Comprehensive Income |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Other components of net periodic pension and postretirement benefits | (55) | (55)
Actuarial Losses | Reclassification out of Accumulated Other Comprehensive Income |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Other components of net periodic pension and postretirement benefits | $ 73 | $ 73

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