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FAIR VALUE MEASUREMENTS - Derivative Instruments, Gain (Loss) (Details)	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) property item	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) item
Cash flow hedges
Reclassification of gain (loss)
Gain or loss recognized with respect to cash flow hedges' ineffectiveness		$ 0	$ 0	$ 0
Properties located in Kansas City, Missouri and Ann Arbor, Michigan
Reclassification of gain (loss)
Number of real estate properties sold | property		2
Properties located in Kansas City, Missouri and Ann Arbor, Michigan | Cash flow hedges
Reclassification of gain (loss)
Loss on derivative instrument reclassified into interest expense		$ 201,000
Interest rate swap | Cash flow hedges
Fair Value Measurements
Amount of (loss) gain recognized on derivatives in Other comprehensive income (loss)		(221,000)	255,000	(3,722,000)
Amount of (loss) reclassification from Accumulated other comprehensive income (loss) into Interest expense		$ (1,786,000)	(2,624,000)	$ (2,554,000)
Reclassification of gain (loss)
Number of interest rate derivative instruments terminated | item		3		1
Additional amount to be reclassified during the next twelve months	$ 565,000
Credit risk related contingent feature
Fair value of derivative in a liability position, including accrued interest but excluding adjustments for nonperformance risk		$ 1,638,000	2,951,000
Accrued interest on derivative in a liability position		53,000	113,000
Termination value of derivative agreement		$ 1,638,000	2,951,000
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		$ 10,491,000
Amount of (loss) gain recognized on derivatives in Other comprehensive income (loss)		15,000	(31,000)	$ (109,000)
Amount of (loss) reclassification from Accumulated other comprehensive income (loss) into Equity in earnings of unconsolidated joint ventures		$ (61,000)	(95,000)	(108,000)
Reclassification of gain (loss)
Additional amount to be reclassified during the next twelve months	$ 7,000
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
Interest rate swap | Cash flow hedges | Accrued expenses and other liabilities
Credit risk related contingent feature
Adjustments for nonperformance risk		$ 93,000	$ 143,000

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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 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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-SubTopic 10
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-Paragraph 4H
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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Fixed interest rate related to the interest rate derivative.

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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 portion of losses on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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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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