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EMPLOYEE BENEFIT PLANS (Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Amounts recognized in the consolidated balance sheets |  |
Current liabilities (included in current portion of pension and postretirement liabilities) | $ (8,659) | $ (753)
Noncurrent liabilities (included in pension and postretirement liabilities) | (31,504) | (39,827)
Nonunion Defined Benefit Pension Plan |  |
Amounts recognized in the consolidated balance sheets |  |
Current liabilities (included in current portion of pension and postretirement liabilities) | (6,727) |
Noncurrent liabilities (included in pension and postretirement liabilities) |  | (12,586)
Liabilities recognized | (6,727) | (12,586)
Supplemental Benefit Plan |  |
Amounts recognized in the consolidated balance sheets |  |
Current liabilities (included in current portion of pension and postretirement liabilities) | (937) |
Noncurrent liabilities (included in pension and postretirement liabilities) | (3,011) | (3,897)
Liabilities recognized | (3,948) | (3,897)
Postretirement Health Benefit Plan |  |
Amounts recognized in the consolidated balance sheets |  |
Current liabilities (included in current portion of pension and postretirement liabilities) | (995) | (753)
Noncurrent liabilities (included in pension and postretirement liabilities) | (28,493) | (23,344)
Liabilities recognized | $ (29,488) | $ (24,097)

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