FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring and Nonrecurring (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
LIBOR \| Minimum
Valuation of financial instruments
Derivative, Basis Spread on Variable Rate	1.50%
LIBOR \| Maximum
Valuation of financial instruments
Derivative, Basis Spread on Variable Rate	3.75%
Interest rate swap
Valuation of financial instruments
Derivative Asset	$ 5,238	$ 19,585
Derivative Liability		1,552
Interest rate swap \| LIBOR
Valuation of financial instruments
Derivative, Basis Spread on Variable Rate	2.00%
Fair Value, Measurements, Nonrecurring
Valuation of financial instruments
Assets held for sale		30,195
Fair Value, Measurements, Nonrecurring \| Significant Other Observable Inputs (Level 2)
Valuation of financial instruments
Assets held for sale		30,195
Fair Value, Measurements, Recurring \| Interest rate swap
Valuation of financial instruments
Derivative Asset	$ 6,090	19,585
Derivative Liability	852	1,552
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Interest rate swap
Valuation of financial instruments
Derivative Asset	6,090	19,585
Derivative Liability	$ 852	$ 1,552

Fair value portion of assets classified as held for sale.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258

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+ References

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-Name Accounting Standards Codification
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-Section 50
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 210
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