Equity - AOCI Reconciliation (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 4,370,934	$ 3,848,430
Other comprehensive loss before reclassifications	(241,189)	(89,483)
Reclassification of gains from AOCI	13,373	(17,284)
Net current period OCI	(228,254)	(114,921)
OCI attributable to noncontrolling interests	66,245	35,124
OCI attributable to common stockholders	(162,009)	(79,797)
Ending balance	4,044,339	4,052,360
Unconsolidated Funds
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive loss before reclassifications	(403)	(6,928)
Reclassification of gains from AOCI	(35)	(1,226)
AOCI
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(17,462)	53,944
Ending balance	$ (179,471)	$ (25,853)