Segments - Schedule of Reconciliation of NOI to Net (Loss) Income Attributable to Common Stockholders (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting [Abstract]
NOI	$ 116,568	$ 110,532
Fee income	3,465	9,556
Depreciation and amortization expense	(65,156)	(62,992)
General and administrative expenses	(12,631)	(13,581)
Transaction related costs	(120)	(275)
NOI from unconsolidated joint ventures	(4,740)	(4,823)
(Loss) income from unconsolidated joint ventures	(62)	1,937
(Loss) income from unconsolidated real estate funds	(66)	288
Interest and other income, net	2,016	3,200
Interest and debt expense	(36,082)	(37,018)
Loss on early extinguishment of debt		(2,715)
Unrealized gain on interest rate swaps		1,802
Net income before income taxes	3,192	5,911
Income tax expense	(477)	(4,282)
Net income	2,715	1,629
Consolidated joint ventures	(1,055)	(1,291)
Consolidated real estate fund	(430)	88
Operating Partnership	(116)	(54)
Net income attributable to common stockholders	$ 1,114	$ 372