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EMPLOYEE BENEFIT PLANS (Included in AOCI) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Nonunion Defined Benefit Pension Plan |  |
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost |  |
Unrecognized net actuarial loss | $ 4,034 | $ 22,588
Total | 4,034 | 22,588
Supplemental Benefit Plan |  |
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost |  |
Unrecognized net actuarial loss | 405 | 543
Total | 405 | 543
Postretirement Health Benefit Plan |  |
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost |  |
Unrecognized net actuarial loss | 7,416 | 2,764
Unrecognized prior service credit | (34) | (127)
Total | $ 7,382 | $ 2,637

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