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FAIR VALUE MEASUREMENTS (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($)
Fair value of financial assets and liabilities carried at fair value
Aggregate carrying value of total debt	$ 1,600,000	$ 1,600,000
Estimated fair value of total debt	$ 1,700,000	1,600,000
Interest rate swap
Fair value of financial assets and liabilities carried at fair value
Number of counterparties to derivative contracts who experienced significant downgrades in 2017 | item	0
Level 2
Fair value of financial assets and liabilities carried at fair value
Total liabilities at fair value	$ 406	2,280
Level 2 | Interest rate swap
Fair value of financial assets and liabilities carried at fair value
Derivative Liabilities	$ 406	$ 2,280

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- Definition

Represents the number of counterparties to derivative contracts who experienced significant downgrades in the current fiscal year.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 20
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-Paragraph 4D
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Fair value of financial and nonfinancial obligations.

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