CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Series D Preferred Stock [Member]	Preferred Stock [Member]	Total Stockholders’ Equity	Total Stockholders’ Equity Series D Preferred Stock [Member]	Total Stockholders’ Equity Preferred Stock [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Series D Preferred Stock [Member]	Accumulated Deficit [Member] Preferred Stock [Member]	Non-Controlling Interests [Member]	Non-Controlling Interests [Member] Preferred Stock [Member]
Beginning balance (shares) at Dec. 31, 2016							42,834,138	974,146,650
Beginning balance at Dec. 31, 2016	$ 8,619,533			$ 8,447,361			$ 428	$ 9,741	$ 12,640,171	$ (2,556)	$ (4,200,423)			$ 172,172
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchases of common stock under Share Repurchase Program								(140,832)
Repurchases of common stock under the Share Repurchase Program	(1,184)			(1,184)				$ (1)	(1,183)
Equity-based compensation, net (shares)								232,640
Equity-based compensation, net	3,113			3,113				$ 2	3,111
Distributions declared on common stock	(133,929)			(133,929)							(133,929)
Distributions to non-controlling interest holders	(3,326)													(3,326)
Distributions		$ (178)	$ (17,973)		$ (178)	$ (17,937)						$ (178)	$ (17,937)		$ (36)
Net income	14,790			14,438							14,438			352
Other comprehensive loss	780			761						761				19
Ending balance (shares) at Mar. 31, 2017							42,834,138	974,238,458
Ending balance at Mar. 31, 2017	8,481,626			8,312,445			$ 428	$ 9,742	12,642,099	(1,795)	(4,338,029)			169,181
Beginning balance (shares) at Dec. 31, 2017							42,834,138	974,208,583
Beginning balance at Dec. 31, 2017	8,042,876			7,884,278			$ 428	$ 9,742	12,654,258	(3,569)	(4,776,581)			158,598
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchases of common stock to settle tax obligation (shares)								(6,399,666)
Repurchases of common stock to settle tax obligation	(44,585)			(44,585)				$ (64)	(44,521)
Repurchases of common stock under Share Repurchase Program								(230,436)
Repurchases of common stock under the Share Repurchase Program	(1,660)			(1,660)				$ (2)	(1,658)
Equity-based compensation, net (shares)								576,005
Equity-based compensation, net	2,932							$ 5	2,927
Distributions declared on common stock	(133,615)										(133,615)
Distributions to non-controlling interest holders	(3,264)													(3,264)
Distributions		$ (11)	$ (17,973)		$ (11)	$ (17,937)						$ (11)	$ (17,937)		$ (36)
Net income	32,537			31,795							31,795			742
Other comprehensive loss	(732)			(715)						(715)				(17)
Ending balance (shares) at Mar. 31, 2018							42,834,138	968,154,486
Ending balance at Mar. 31, 2018	$ 7,876,505			$ 7,720,482			$ 428	$ 9,681	$ 12,611,006	$ (4,284)	$ (4,896,349)			$ 156,023