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FAIR VALUE OF FINANCIAL INSTRUMENTS - RECURRING (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Nov. 10, 2016	Nov. 04, 2015
Fair value of financial instruments
Floating rate debt	$ 509,767	$ 524,424
Secured Debt | $400 Million Credit Facility
Fair value of financial instruments
Face amount of term loan facility	400,000	400,000	$ 400,000
Line of Credit Facility | $98 Million Credit Facility
Fair value of financial instruments
Face amount of term loan facility	98,000	98,000		$ 98,000
Carrying Value
Fair value of financial instruments
Cash and cash equivalents	172,775	174,479
Restricted cash	28,424	30,467
Floating rate debt	509,767	524,424
Fair value
Fair value of financial instruments
Cash and cash equivalents	172,775	174,479
Restricted cash	28,424	30,467
Floating rate debt	$ 509,767	$ 524,424

X

- Definition

Amount of long-term debt including PIK interest before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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-Subparagraph (SX 210.9-03(1)(a))
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