Segments - Schedule of Reconciliation of NOI to Net (Loss) Income Attributable to Common Stockholders (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting [Abstract]
NOI									$ 494,009	$ 486,984	$ 448,262
Fee income									22,744	18,629	24,212
Depreciation and amortization expense									(248,347)	(258,225)	(266,037)
General and administrative expenses									(68,556)	(57,563)	(61,577)
NOI from unconsolidated joint ventures									(22,409)	(20,730)	(19,643)
Interest and other income (loss), net									9,844	8,117	(9,031)
Interest and debt expense									(156,679)	(147,653)	(143,762)
Loss on early extinguishment of debt									(11,989)		(7,877)
Real estate impairment loss									(42,000)	(46,000)
Gain on sale of real estate									1,140	36,845	133,989
Other, net									(7,048)	1,728	13,817
Net (loss) income before income taxes									(29,291)	22,132	112,353
Income tax expense									(312)	(3,139)	(5,177)
Net (loss) income									(29,603)	18,993	107,176
Consolidated joint ventures									(11,022)	(8,182)	10,365
Consolidated real estate fund									(313)	(720)	(19,797)
Operating Partnership									4,039	(944)	(11,363)
Net (loss) income attributable to common stockholders	$ (50,145)	$ 7,082	$ 2,455	$ 3,709	$ 5,318	$ 37,531	$ (34,816)	$ 1,114	$ (36,899)	$ 9,147	$ 86,381