Fair Value (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) venture derivative	Mar. 31, 2019 USD ($)
Derivative instruments and Hedging Activities
Derivative, Notional Amounts Settled During Period	$ 350,000,000
Payments for (Proceeds from) Hedge, Financing Activities	$ 20,314,000	$ 0
Amortization Period of Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge	10 years
Loss on cash flow hedges	$ (17,603,000)	$ (7,231,000)
Cash Flow Hedges
Derivative instruments and Hedging Activities
Number of derivative instruments held | derivative	2
Interest Rate Swap | Cash Flow Hedges
Derivative instruments and Hedging Activities
Derivative, Notional Amounts Entered into During Period	$ 150,000,000
Derivative, Notional Amount	$ 150,000,000
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	$ 9,015,000
Not Designated as Hedging Instrument
Derivative instruments and Hedging Activities
Number of derivative instruments held | derivative	5
Not Designated as Hedging Instrument | Interest Rate Cap
Derivative instruments and Hedging Activities
Derivative, Notional Amount	$ 442,611,000
Unsecured notes | Unsecured Notes 2.30 Percent [Member]
Derivative instruments and Hedging Activities
Debt Instrument, Interest Rate, Stated Percentage	2.30%