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EMPLOYEE BENEFIT PLANS (Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
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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- Definition

Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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