Derivative Contracts - Impact of Hedges on AOCI and Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative [Line Items]
Loss recorded in AOCI before reclassifications			$ (242,115)	$ (116,251)
Interest Expense presented in the consolidated statements of operations	$ (36,167)	$ (40,397)	(106,777)	(107,753)
Income from unconsolidated Funds presented in the consolidated statements of operations	$ 145	$ 1,831	328	5,589
Unconsolidated Funds
Derivative [Line Items]
Loss recorded in AOCI before reclassifications			(407)	(7,995)
Cash Flow Hedging | Derivatives Designated as Cash Flow Hedges
Derivative [Line Items]
Loss recorded in AOCI before reclassifications			(242,115)	(116,251)
Loss (gain) reclassified from AOCI			31,293	(22,202)
Cash Flow Hedging | Derivatives Designated as Cash Flow Hedges | Unconsolidated Funds
Derivative [Line Items]
Loss recorded in AOCI before reclassifications			(407)	(7,995)
Loss (gain) reclassified from AOCI			$ 35	$ (1,652)