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EMPLOYEE BENEFIT PLANS (Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Amounts recognized in the consolidated balance sheets |  |
Current portion of pension and postretirement liabilities | $ (3,572) | $ (8,659)
Pension and postretirement liabilities, less current portion | (20,294) | (31,504)
Nonunion Defined Benefit Pension Plan |  |
Amounts recognized in the consolidated balance sheets |  |
Current portion of pension and postretirement liabilities |  | (6,727)
Liabilities recognized |  | (6,727)
Supplemental Benefit Plan |  |
Amounts recognized in the consolidated balance sheets |  |
Current portion of pension and postretirement liabilities | (2,886) | (937)
Pension and postretirement liabilities, less current portion | (350) | (3,011)
Liabilities recognized | (3,236) | (3,948)
Postretirement Health Benefit Plan |  |
Amounts recognized in the consolidated balance sheets |  |
Current portion of pension and postretirement liabilities | (686) | (995)
Pension and postretirement liabilities, less current portion | (19,944) | (28,493)
Liabilities recognized | $ (20,630) | $ (29,488)

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