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Fair Value Measurements - Derivative Instruments, Gain (Loss) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) item	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) item	Jun. 30, 2016 USD ($) item	Jun. 30, 2018 USD ($)
Reclassification of gain (loss)
Loss on derivative instrument reclassified into interest expense			$ 118,000
Cash flow hedges
Reclassification of gain (loss)
Gain or loss recognized with respect to cash flow hedges' ineffectiveness		$ 0		$ 0
Property located in Kansas, Missouri | Cash flow hedges
Reclassification of gain (loss)
Loss on derivative instrument reclassified into interest expense			118,000
Interest rate swap | Cash flow hedges
Fair Value Measurements
Amount of loss recognized on derivatives in Other comprehensive loss	$ (1,055,000)	(3,079,000)	(986,000)	(7,582,000)
Amount of loss reclassification from Accumulated other comprehensive loss into Interest expense	(545,000)	(785,000)	(1,054,000)	$ (1,387,000)
Reclassification of gain (loss)
Additional amount to be reclassified during the next twelve months					$ 1,121,000
Number of interest rate derivative instruments terminated | item				3
Credit risk related contingent feature
Fair value of derivative in a liability position, including accrued interest but excluding adjustments for nonperformance risk	2,794,000		2,794,000
Accrued interest on derivative in a liability position	88,000		88,000
Termination value of derivative agreement	$ 2,794,000		2,794,000
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%		50.00%
Number interest rate derivatives outstanding | item	2		2
Notional Amount	$ 10,620,000		$ 10,620,000
Amount of loss recognized on derivatives in Other comprehensive loss	(21,000)	(55,000)	(12,000)	$ (185,000)
Amount of loss reclassification from Accumulated other comprehensive loss into Equity in earnings of unconsolidated joint ventures	$ (16,000)	(24,000)	$ (35,000)	(49,000)
Reclassification of gain (loss)
Additional amount to be reclassified during the next twelve months					$ 37,000
Interest rate swap | Cash flow hedges | Unconsolidated joint ventures | Minimum
Fair Value Measurements
Fixed Interest Rate (as a percent)	3.49%		3.49%
Interest rate swap | Cash flow hedges | Unconsolidated joint ventures | Maximum
Fair Value Measurements
Fixed Interest Rate (as a percent)	5.81%		5.81%
Interest rate swap | Cash flow hedges | Prepayment costs on debt
Reclassification of gain (loss)
Loss on termination of interest rate swap		$ 154,000		$ 178,000
Interest rate swap | Cash flow hedges | Accrued expenses and other liabilities
Credit risk related contingent feature
Termination value of derivative agreement	$ 2,651,000		$ 2,651,000

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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 effective portion of net gain (loss) reclassified from accumulated other comprehensive income into equity in earnings of unconsolidated joint ventures on derivative instruments designated and qualifying as hedging instruments.

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Represents the amount of adjustments for nonperformance risk included in termination liability.

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Number of interest rate derivate instruments terminated by the entity at the reporting date.

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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
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-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 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 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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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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Number of interest rate derivative instruments held by the entity at the reporting date.

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