Segments - Schedule of Reconciliation of NOI to Net Income Attributable to Common Stockholders (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting [Abstract]
NOI	$ 124,483	$ 123,154	$ 368,289	$ 362,655
Fee income	7,159	4,079	17,371	12,953
Depreciation and amortization expense	(63,058)	(64,610)	(188,772)	(194,541)
General and administrative expenses	(16,319)	(14,452)	(51,457)	(44,278)
NOI from unconsolidated joint ventures	(4,973)	(4,448)	(14,569)	(13,757)
Interest and other income, net	1,222	2,778	7,705	6,888
Interest and debt expense	(37,325)	(37,105)	(111,462)	(109,996)
Real estate impairment loss				(46,000)
Gain on sale of real estate	1,140	36,845	1,140	36,845
Other, net	(1,912)	(166)	(4,248)	1,800
Net income before income taxes	10,417	46,075	23,997	12,569
Income tax benefit (expense)	583	(1,814)	(823)	(2,171)
Net income	11,000	44,261	23,174	10,398
Consolidated joint ventures	(3,051)	(2,713)	(8,253)	(5,520)
Consolidated real estate fund	(109)	(86)	(256)	(668)
Operating Partnership	(758)	(3,931)	(1,419)	(381)
Net income attributable to common stockholders	$ 7,082	$ 37,531	$ 13,246	$ 3,829