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EMPLOYEE BENEFIT PLANS (Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Amounts recognized in the consolidated balance sheets
Noncurrent liabilities (included in pension and postretirement liabilities)	$ (39,827)	$ (35,848)
Nonunion Defined Benefit Pension Plan
Amounts recognized in the consolidated balance sheets
Noncurrent liabilities (included in pension and postretirement liabilities)	(12,586)	(7,201)
Liabilities recognized	(12,586)	(7,201)
Supplemental Benefit Plan
Amounts recognized in the consolidated balance sheets
Current liabilities (included in accrued expenses)		(989)
Noncurrent liabilities (included in pension and postretirement liabilities)	(3,897)	(3,805)
Liabilities recognized	(3,897)	(4,794)
Postretirement Health Benefit Plan
Amounts recognized in the consolidated balance sheets
Current liabilities (included in accrued expenses)	(753)	(690)
Noncurrent liabilities (included in pension and postretirement liabilities)	(23,344)	(24,842)
Liabilities recognized	$ (24,097)	$ (25,532)

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919

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

+ References

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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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