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Fair Value Measurements - Derivative Instruments, Gain (Loss) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Fair Value Measurements
Amount of reclassification from Accumulated other comprehensive (loss) income into Equity in earnings (loss) of unconsolidated joint ventures		$ 110,000		$ 110,000
Reclassification of realized gain (loss) from Accumulated other comprehensive income (loss) to earnings	$ 161,000		$ 201,000
Interest rate swap | Cash flow hedges
Fair Value Measurements
Amount of (loss) gain recognized on derivatives in other comprehensive (loss) income	(1,319,000)	827,000	(5,281,000)	4,336,000
Amount of reclassification from Accumulated other comprehensive (loss) income into Interest expense	(139,000)	(44,000)	(6,000)	(335,000)
Reclassification of gain (loss)
Amount of gain (loss) recognized with respect to effectiveness testing	0	$ 0	0	0
Additional amount to be reclassified during the next twelve months			555,000
Credit risk related contingent feature
Accrued interest payable on derivatives in a liability position	6,000		6,000		$ 8,000
Fair value of derivative in a liability position, including accrued interest but excluding adjustments for non-performance risk	3,622,000		3,622,000		554,000
Termination liability value	$ 3,622,000		3,622,000		554,000
Interest rate swap | Cash flow hedges | Accrued expenses and other liabilities
Credit risk related contingent feature
Adjustments for non-performance risk			$ 202,000		$ 41,000
Unconsolidated Joint Ventures | Interest rate swap | Cash flow hedges
Fair Value Measurements
Amount of (loss) gain recognized on derivatives in other comprehensive (loss) income				69,000
Amount of reclassification from Accumulated other comprehensive (loss) income into Equity in earnings (loss) of unconsolidated joint ventures				$ 103,000

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Represents the accrued interest payable on derivatives in a liability position.

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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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Amount of gain (loss) recognized with respect to hedge effectiveness or on amounts excluded from testing.

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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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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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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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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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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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