Derivative Contracts - Impact of Hedges on AOCI and Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative [Line Items]
Gain (loss) recorded in AOCI before reclassifications			$ (241,189)	$ (89,483)
Interest Expense presented in the consolidated statements of operations	$ (35,190)	$ (34,063)	(70,610)	(67,356)
Income from unconsolidated Funds presented in the consolidated statements of operations	$ (140)	$ 2,207	183	3,758
Unconsolidated Funds
Derivative [Line Items]
Gain (loss) recorded in AOCI before reclassifications			(403)	(6,928)
Cash Flow Hedging | Derivatives Designated as Cash Flow Hedges
Derivative [Line Items]
Gain (loss) recorded in AOCI before reclassifications			(241,189)	(89,483)
Loss (gain) reclassified from AOCI			13,373	(17,284)
Cash Flow Hedging | Derivatives Designated as Cash Flow Hedges | Unconsolidated Funds
Derivative [Line Items]
Gain (loss) recorded in AOCI before reclassifications			(403)	(6,928)
Loss (gain) reclassified from AOCI			$ (35)	$ (1,226)