CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Total Stockholders’ Equity	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Non-Controlling Interests [Member]	Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member] Total Stockholders’ Equity	Convertible Preferred Stock [Member] Accumulated Deficit [Member]	Convertible Preferred Stock [Member] Non-Controlling Interests [Member]
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 under the share repurchase programs (shares)				(6,399,666)
Repurchases of Common Stock under the share repurchase programs	(44,585)	(44,585)		$ (64)	(44,521)
Repurchases of Common Stock to settle tax obligation (shares)				(230,436)
Repurchases of Common Stock to settle tax obligation	(1,660)	(1,660)		$ (2)	(1,658)
Equity-based compensation, net (shares)				576,005
Equity-based compensation, net	2,932	2,932		$ 5	2,927
Distributions declared on Common Stock — $0.1375 per common share	(133,104)	(133,104)					(133,104)
Distributions to non-controlling interest holders	(3,264)							(3,264)
Dividend equivalents on awards granted under the Equity Plan	(522)	(522)					(522)
Distributions to preferred shareholders and unitholders									$ (17,973)	$ (17,937)	$ (17,937)	$ (36)
Net income (loss)	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
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]
Distributions payable relinquished	0
Cumulative adjustment for stock forfeitures	0
Net income (loss)	(115,872)
Other comprehensive loss	2,600
Ending balance (shares) at Sep. 30, 2018			42,834,138	967,522,113
Ending balance at Sep. 30, 2018	7,423,874	7,278,110	$ 428	$ 9,674	12,612,407	(1,031)	(5,343,368)	145,764
Beginning balance (shares) at Mar. 31, 2018			42,834,138	968,154,486
Beginning balance at Mar. 31, 2018	7,876,505	7,720,482	$ 428	$ 9,681	12,611,006	(4,284)	(4,896,349)	156,023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of OP Units to Common Stock (shares)				32,439
Conversion of OP Units to Common Stock	0	241		$ 0	241			(241)
Repurchases of Common Stock under the share repurchase programs (shares)				(807,210)
Repurchases of Common Stock under the share repurchase programs	(5,569)	(5,569)		$ (8)	(5,561)
Repurchases of Common Stock to settle tax obligation (shares)				(69,931)
Repurchases of Common Stock to settle tax obligation	(488)	(488)		$ (1)	(487)
Equity-based compensation, net (shares)				184,011
Equity-based compensation, net	3,948	3,948		$ 2	3,946
Distributions declared on Common Stock — $0.1375 per common share	(133,010)	(133,010)					(133,010)
Distributions to non-controlling interest holders	(3,262)							(3,262)
Dividend equivalents on awards granted under the Equity Plan	(274)	(274)					(274)
Distributions to preferred shareholders and unitholders									(17,973)	(17,937)	(17,937)	(36)
Net income (loss)	(74,467)	(72,670)					(72,670)	(1,797)
Other comprehensive loss	(6)	(6)				(6)		0
Ending balance (shares) at Jun. 30, 2018			42,834,138	967,493,795
Ending balance at Jun. 30, 2018	7,645,404	7,494,717	$ 428	$ 9,674	12,609,145	(4,290)	(5,120,240)	150,687
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchases of Common Stock to settle tax obligation (shares)				(7,597)
Repurchases of Common Stock to settle tax obligation	(61)	(61)		$ 0	(61)
Equity-based compensation, net (shares)				35,915
Equity-based compensation, net	3,323	3,323		$ 0	3,323
Contributions from non-controlling interest holders	120							120
Distributions declared on Common Stock — $0.1375 per common share	(133,015)	(133,015)					(133,015)
Distributions to non-controlling interest holders	(3,261)							(3,261)
Dividend equivalents on awards granted under the Equity Plan	(59)	(59)					(59)
Distributions to preferred shareholders and unitholders									(17,973)	(17,937)	(17,937)	(36)
Net income (loss)	(73,942)	(72,117)					(72,117)	(1,825)
Other comprehensive loss	3,338	3,259				3,259		79
Ending balance (shares) at Sep. 30, 2018			42,834,138	967,522,113
Ending balance at Sep. 30, 2018	7,423,874	7,278,110	$ 428	$ 9,674	12,612,407	(1,031)	(5,343,368)	145,764
Beginning balance (shares) at Dec. 31, 2018			42,834,138	967,515,165
Beginning balance at Dec. 31, 2018	7,300,144	7,157,059	$ 428	$ 9,675	12,615,472	(1,280)	(5,467,236)	143,085
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, net (shares)				3,309,808
Issuance of Common Stock, net	27,544	27,544		$ 33	27,511
Conversion of OP Units to Common Stock (shares)				0
Conversion of OP Units to Common Stock	0	(26)		$ 0	(26)			26
Conversion of Series F Preferred Units to Series F Preferred Stock (shares)			37,108
Conversion of Series F Preferred Units to Series F Preferred Stock	0	923	$ 1		922			(923)
Repurchases of Common Stock to settle tax obligation (shares)				(199,083)
Repurchases of Common Stock to settle tax obligation	(1,595)	(1,595)		$ (2)	(1,593)
Equity-based compensation, net (shares)				950,487
Equity-based compensation, net	2,872	2,872		$ 10	2,862
Contributions from non-controlling interest holders	64							64
Distributions declared on Common Stock — $0.1375 per common share	(133,480)	(133,480)					(133,480)
Distributions to non-controlling interest holders	(3,262)							(3,262)
Dividend equivalents on awards granted under the Equity Plan	(1,222)	(1,222)					(1,222)
Distributions to preferred shareholders and unitholders									(17,973)	(17,940)	(17,940)	(33)
Net income (loss)	70,971	69,304					69,304	1,667
Other comprehensive loss	(11,189)	(10,922)				(10,922)		(267)
Ending balance (shares) at Mar. 31, 2019			42,871,246	971,576,377
Ending balance at Mar. 31, 2019	7,232,874	7,092,517	$ 429	$ 9,716	12,645,148	(12,202)	(5,550,574)	140,357
Beginning balance (shares) at Dec. 31, 2018			42,834,138	967,515,165
Beginning balance at Dec. 31, 2018	7,300,144	7,157,059	$ 428	$ 9,675	12,615,472	(1,280)	(5,467,236)	143,085
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distributions payable relinquished	7,799
Cumulative adjustment for stock forfeitures	(191,974)
Net income (loss)	(378,274)
Other comprehensive loss	(47,669)
Ending balance (shares) at Sep. 30, 2019			38,871,246	1,067,688,887
Ending balance at Sep. 30, 2019	7,022,042	7,017,265	$ 389	$ 10,677	13,360,675	(47,886)	(6,306,590)	4,777
Beginning balance (shares) at Mar. 31, 2019			42,871,246	971,576,377
Beginning balance at Mar. 31, 2019	7,232,874	7,092,517	$ 429	$ 9,716	12,645,148	(12,202)	(5,550,574)	140,357
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, net (shares)				1,773,456
Issuance of Common Stock, net	14,534	14,534		$ 18	14,516
Repurchases of Common Stock to settle tax obligation (shares)				0
Repurchases of Common Stock to settle tax obligation	(9)	(9)		$ 0	(9)
Equity-based compensation, net (shares)				36,066
Equity-based compensation, net	3,883	3,883		$ 0	3,883
Distributions declared on Common Stock — $0.1375 per common share	(133,841)	(133,841)					(133,841)
Distributions to non-controlling interest holders	(3,264)							(3,264)
Dividend equivalents on awards granted under the Equity Plan	(44)	(44)					(44)
Distributions to preferred shareholders and unitholders									(17,973)	(17,958)	(17,958)	(15)
Distributions payable relinquished	6,429							6,429
Cumulative adjustment for stock forfeitures	(26,537)	(8,520)			(8,520)			(18,017)
Net income (loss)	292,284	285,658					285,658	6,626
Other comprehensive loss	(16,209)	(15,824)				(15,824)		(385)
Ending balance (shares) at Jun. 30, 2019			42,871,246	973,385,899
Ending balance at Jun. 30, 2019	7,352,127	7,220,396	$ 429	$ 9,734	12,655,018	(28,026)	(5,416,759)	131,731
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, net (shares)				94,300,000
Issuance of Common Stock, net	886,926	886,926		$ 943	885,983
Redemption of Series F Preferred Stock (shares)			(4,000,000)
Redemption of Series F Preferred Stock	(100,096)	(100,096)	$ (40)		(100,056)
Repurchases of Common Stock to settle tax obligation (shares)				(1,248)
Repurchases of Common Stock to settle tax obligation	(14)	(14)			(14)
Equity-based compensation, net (shares)				4,236
Equity-based compensation, net	3,144	3,144			3,144
Distributions declared on Common Stock — $0.1375 per common share	(146,808)	(146,808)					(146,808)
Distributions to non-controlling interest holders	(2,859)							(2,859)
Dividend equivalents on awards granted under the Equity Plan		(26)					(26)		(26)			0
Distributions to preferred shareholders and unitholders									$ (16,578)	$ (16,557)	$ (16,557)	$ (21)
Cumulative adjustment for stock forfeitures	(191,974)	(83,400)			(83,400)			(108,574)
Net income (loss)	(741,529)	(726,440)					(726,440)	(15,089)
Other comprehensive loss	(20,271)	(19,860)				(19,860)		(411)
Ending balance (shares) at Sep. 30, 2019			38,871,246	1,067,688,887
Ending balance at Sep. 30, 2019	$ 7,022,042	$ 7,017,265	$ 389	$ 10,677	$ 13,360,675	$ (47,886)	$ (6,306,590)	$ 4,777