Segments Disclosure - 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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting [Abstract]
NOI	$ 114,753	$ 112,670	$ 225,285	$ 223,654
Fee income	4,448	4,175	14,004	7,592
Depreciation and amortization expense	(68,636)	(67,287)	(131,628)	(142,099)
General and administrative expenses	(16,573)	(12,139)	(30,154)	(26,100)
Transaction related costs	(502)	(508)	(777)	(1,443)
NOI from unconsolidated joint ventures	(4,958)	(4,536)	(9,781)	(8,964)
Income from unconsolidated joint ventures	16,535	2,003	18,472	3,499
Loss from unconsolidated real estate funds	(2,411)	(960)	(2,123)	(1,286)
Interest and other income, net	2,486	1,030	5,686	2,730
Interest and debt expense	(34,817)	(38,009)	(71,835)	(75,128)
Debt breakage costs	(5,162)		(7,877)
Gain on sale of real estate	133,989		133,989
Unrealized gain on interest rate swaps		10,073	1,802	16,933
Net income (loss) before income taxes	139,152	6,512	145,063	(612)
Income tax (expense) benefit	(970)	1,398	(5,252)	1,035
Net income	138,182	7,910	139,811	423
Consolidated joint ventures	(1,897)	(4,107)	(3,188)	(5,359)
Consolidated real estate fund	(20,169)	78	(20,081)	752
Operating Partnership	(13,100)	(693)	(13,154)	878
Net income (loss) attributable to common stockholders	$ 103,016	$ 3,188	$ 103,388	$ (3,306)