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Fair Value Measurements - Derivative Instruments, Gain (Loss) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($) item	Jun. 30, 2017 USD ($) item	Jun. 30, 2018 USD ($) item	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Reclassification of gain (loss)
Amount of reclassification from Accumulated other comprehensive income into Interest expense or Equity as a result of forecasted transaction being no longer probable of occurring				$ (118,000)
Amount of reclassification from Accumulated other comprehensive income to earnings	$ 110,000		$ 110,000
Interest rate swap | Cash flow hedges
Fair Value Measurements
Amount of gain (loss) recognized on derivatives in Other comprehensive income	1,009,000	$ (1,055,000)	3,509,000	(986,000)
Amount of reclassification from Accumulated other comprehensive income into Interest expense	(95,000)	(545,000)	(291,000)	(1,054,000)
Reclassification of gain (loss)
Amount of reclassification from Accumulated other comprehensive income to earnings	110,000	118,000
Amount of effectiveness testing on cash flow hedges	0	0	0	0
Additional amount to be reclassified during the next twelve months			222,000
Credit risk related contingent feature
Accrued interest on derivative in a liability position	9,000		9,000		$ 53,000
Fair value of derivative in a liability position, including accrued interest but excluding adjustments for nonperformance risk	126,000		126,000		1,638,000
Termination value of derivative agreement	$ 126,000		$ 126,000		1,638,000
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			1
Percentage of ownership in unconsolidated joint venture	50.00%		50.00%
Number interest rate derivatives outstanding | item	1		1
Amount of gain (loss) recognized on derivatives in Other comprehensive income	$ 22,000	(21,000)	$ 69,000	(12,000)
Amount of reclassification from Accumulated other comprehensive income into Equity in earnings of unconsolidated joint ventures	$ 110,000	$ (16,000)	103,000	$ (35,000)
Reclassification of gain (loss)
Number of interest rate swaps | item	2	2
Interest rate swap | Cash flow hedges | Accrued expenses and other liabilities
Credit risk related contingent feature
Adjustments for nonperformance risk			8,000		$ 93,000
3.49% Interest rate swaps | Cash flow hedges | Unconsolidated joint ventures
Fair Value Measurements
Notional Amount	$ 6,983,000		$ 6,983,000
Fixed Interest Rate (as a percent)	3.49%		3.49%
5.81% Interest rate swaps | Cash flow hedges | Unconsolidated joint ventures
Fair Value Measurements
Notional Amount	$ 3,402,000		$ 3,402,000
Fixed Interest Rate (as a percent)	5.81%		5.81%

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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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Represents the accrued interest portion of the derivative instrument.

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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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The concept that refers to derivative instruments gain loss reclassified from accumulated other comprehensive income into interest expense as a result of forecasted transaction being no longer probable of occurring.

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Amount of gain or loss excluded from effectiveness testing on the cash flow hedges.

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Number of interest rate swaps as the forecasted hedged transactions were no longer probable of occurring.

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (f)
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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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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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