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Fair Value (Details)	3 Months Ended				6 Months Ended
	Jun. 30, 2019 USD ($) derivative	Mar. 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($) derivative venture	Jun. 30, 2018 USD ($)
Derivative instruments and Hedging Activities
Derivative, Notional Amounts Settled During Period					$ 250,000,000
Payments for (Proceeds from) Hedge, Financing Activities					$ 12,309,000	$ (12,598,000)
Amortization Period of Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge					10 years
(Loss) gain on cash flow hedges	$ (2,888,000)	$ (7,231,000)	$ 0	$ 11,501,000	$ (10,119,000)	$ 11,499,000
Cash Flow Hedges
Derivative instruments and Hedging Activities
Number of derivative instruments held | derivative	4				4
Interest Rate Swap | Cash Flow Hedges
Derivative instruments and Hedging Activities
Derivative, Notional Amounts Entered into During Period					$ 250,000,000
Notional amount	$ 250,000,000				$ 250,000,000
Put Option
Derivative instruments and Hedging Activities
Number of ventures in which entity is required to purchase interest in investment at guaranteed minimum amount | venture					2
Reclassification out of Accumulated Other Comprehensive Income
Derivative instruments and Hedging Activities
Estimated hedging losses to be reclassified from accumulated other comprehensive loss into earnings within the next twelve months					$ 6,983,000
Not Designated as Hedging Instrument
Derivative instruments and Hedging Activities
Number of derivative instruments held | derivative	5				5
Not Designated as Hedging Instrument | Interest Rate Cap
Derivative instruments and Hedging Activities
Notional amount	$ 446,177,000				$ 446,177,000
Unsecured notes | Unsecured Notes 3.30 Percent [Domain]
Derivative instruments and Hedging Activities
Debt Instrument, Interest Rate, Stated Percentage	3.30%				3.30%

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
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Contractual interest rate for funds borrowed, under the debt agreement.

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