Segment Information - Reconciliation of Consolidated NOI to Consolidated Net Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
	Jan. 14, 2016	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting [Abstract]
Consolidated net operating income		$ 78,377		$ 93,967	$ 237,064	$ 272,974
Less:
Interest expense		(20,814)		(27,900)	(64,334)	(83,971)
Interest expense - amortization of deferred financing costs		(645)		(1,010)	(2,063)	(3,377)
Interest expense - financing obligation		(156)		(296)	(679)	(906)
Depreciation and amortization		(46,956)		(58,314)	(142,736)	(160,355)
General and administrative expenses		(5,515)		(6,127)	(20,711)	(21,554)
Equity in loss of real estate ventures		(7,254)		(1,093)	(9,323)	(1,835)
Provision for impairment		0	$ (1,800)	0	(13,069)	(2,508)
Loss on early extinguishment of debt	$ (66,600)	0		0	(66,590)	0
Plus:
Interest income		291		126	970	1,189
Tax credit transaction income		0		11,853	0	11,853
Net gain (loss) on disposition of real estate		(104)		6,083	114,625	16,673
Net gain on sale of undepreciated real estate		188		3,019	188	3,019
Net gain from remeasurement of investments in Real Estate Ventures		0		0	0	758
Net gain on Real Estate Venture transactions		10,472		0	19,529	0
Net income		$ 7,884		$ 20,308	$ 52,871	$ 31,960