Derivative Contracts - Impact of Hedges on AOCI and Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative [Line Items]
(Loss) gain recorded in AOCI before reclassifications	$ (206,597)	$ (21,563)
Interest Expense presented in the consolidated statements of operations	(35,420)	(33,293)
Income from unconsolidated Funds	323	1,551
Unconsolidated Funds
Derivative [Line Items]
(Loss) gain recorded in AOCI before reclassifications	(370)	(2,405)
Cash Flow Hedging | Derivatives Designated as Cash Flow Hedges
Derivative [Line Items]
(Loss) gain recorded in AOCI before reclassifications	(206,597)	(21,563)
(Gain) loss reclassified from AOCI to Interest Expense	(420)	(8,724)
Cash Flow Hedging | Derivatives Designated as Cash Flow Hedges | Unconsolidated Funds
Derivative [Line Items]
(Loss) gain recorded in AOCI before reclassifications	(370)	(2,405)
(Gain) loss reclassified from AOCI to Interest Expense	$ (72)	$ (616)