Segments - Schedule of Reconciliation of NOI to Net Income (Loss) Attributable to Common Stockholders (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting [Abstract]
NOI	$ 120,983	$ 122,933	$ 243,806	$ 239,501
Fee income	4,213	5,409	10,212	8,874
Depreciation and amortization expense	(62,625)	(64,775)	(125,714)	(129,931)
General and administrative expenses	(17,695)	(17,195)	(35,138)	(29,826)
NOI from unconsolidated joint ventures	(4,185)	(4,569)	(9,596)	(9,309)
Interest and other income, net	2,583	2,094	6,483	4,110
Interest and debt expense	(37,213)	(36,809)	(74,137)	(72,891)
Real estate impairment loss		(46,000)		(46,000)
Other, net	(619)	2,214	(2,336)	1,966
Net income (loss) before income taxes	5,442	(36,698)	13,580	(33,506)
Income tax (expense) benefit	(268)	120	(1,406)	(357)
Net income (loss)	5,174	(36,578)	12,174	(33,863)
Consolidated joint ventures	(2,408)	(1,752)	(5,202)	(2,807)
Consolidated real estate fund	(53)	(152)	(147)	(582)
Operating Partnership	(258)	3,666	(661)	3,550
Net income (loss) attributable to common stockholders	$ 2,455	$ (34,816)	$ 6,164	$ (33,702)