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FAIR VALUE MEASUREMENTS - Derivative Instruments, Gain (Loss) (Details)	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)
Derivative financial instruments related to unconsolidated joint venture
Number of derivative agreements for which the Parent Company could be liable in event of default by a subsidiary | item		1
Cash flow hedges
Reclassification of gain (loss)
Gain or loss recognized with respect to cash flow hedges' ineffectiveness		$ 0	$ 0	$ 0
Interest rate swap | Cash flow hedges
Fair Value Measurements
Amount of loss recognized on derivatives in Other comprehensive loss		255,000	(3,722,000)	(4,453,000)
Amount of loss reclassification from Accumulated other comprehensive loss into Interest expense		$ (2,624,000)	$ (2,554,000)	(1,810,000)
Reclassification of gain (loss)
Number of interest rate derivative instruments terminated | item		3	1
Credit risk related contingent feature
Fair value of derivative in a liability position, including accrued interest but excluding adjustments for nonperformance risk		$ 2,951,000
Accrued interest on derivative in a liability position		113,000
Termination value of derivative agreement		2,951,000
Adjustments for nonperformance risk		$ 143,000
Interest rate swap | Cash flow hedges | Unconsolidated joint ventures
Fair Value Measurements
Number of unconsolidated joint ventures of the entity with interest rate derivatives outstanding | item		3
Percentage of ownership in unconsolidated joint venture		50.00%
Number interest rate derivatives outstanding | item		2
Notional Amount		$ 10,747,000
Amount of loss recognized on derivatives in Other comprehensive loss		(31,000)	$ (109,000)	(32,000)
Amount of loss reclassification from Accumulated other comprehensive loss into Interest expense		$ (95,000)	(108,000)	(55,000)
Interest rate swap | Cash flow hedges | Unconsolidated joint ventures | Minimum
Fair Value Measurements
Fixed Interest Rate (as a percent)		3.49%
Interest rate swap | Cash flow hedges | Unconsolidated joint ventures | Maximum
Fair Value Measurements
Fixed Interest Rate (as a percent)		5.81%
Interest rate swap | Cash flow hedges | Prepayment costs on debt
Reclassification of gain (loss)
Loss on termination of interest rate swap		$ 178,000	$ 472,000	$ 0
Interest rate swap | Cash flow hedges | Accrued Expenses And Other Liabilities [Member]
Credit risk related contingent feature
Termination value of derivative agreement		$ 2,808,000
Forecast | Interest rate swap | Cash flow hedges
Reclassification of gain (loss)
Additional amount to be reclassified during the next twelve months	$ 1,744,000
Forecast | Interest rate swap | Cash flow hedges | Unconsolidated joint ventures
Reclassification of gain (loss)
Additional amount to be reclassified during the next twelve months	$ 66,000

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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The number of derivative agreements for which the Parent Company could be liable in event of default by a subsidiary.

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The aggregate fair value of assets needed to immediately settle the derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

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-Publisher FASB
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-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
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Fixed interest rate related to the interest rate derivative.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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