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EMPLOYEE BENEFIT PLANS (Included in AOCI) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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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 (gain) loss |  | $ 4,034
Total |  | 4,034
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 (gain) loss | $ 127 | 405
Total | 127 | 405
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 (gain) loss | (3,024) | 7,416
Unrecognized prior service credit | (1) | (34)
Total | $ (3,025) | $ 7,382

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