Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Preferred Shares	Common Shares	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Distributions in Excess of Retained Earnings	Total Shareholders' Equity	Non-Controlling Interests
Preferred stock, beginning balance (in shares) at Dec. 31, 2018		20,400,000
Common stock, beginning balance (in shares) at Dec. 31, 2018			130,311,289
Beginning balance at Dec. 31, 2018	$ 3,769,930	$ 204	$ 1,303	$ 4,065,804	$ 1,330	$ (308,806)	$ 3,759,835	$ 10,095
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares, net of offering costs	(275)			(275)			(275)
Issuance of common shares for Board of Trustees compensation (in shares)			25,282
Issuance of common shares for Board of Trustees compensation	740		$ 1	739			740
Repurchase of common shares (in shares)			(126,681)
Repurchase of common shares	(4,009)		$ (1)	(4,008)			(4,009)
Share-based compensation (in shares)			275,066
Share-based compensation	6,100		$ 2	5,269			5,271	829
Distributions on common shares/units	(149,754)					(149,307)	(149,307)	(447)
Distributions on preferred shares	(24,417)					(24,417)	(24,417)
Other comprehensive income (loss):
Unrealized gain (loss) on derivative instruments	(38,002)				(38,002)		(38,002)
Net income (loss)	96,153					95,899	95,899	254
Preferred stock, ending balance (in shares) at Sep. 30, 2019		20,400,000
Common stock, ending balance (in shares) at Sep. 30, 2019			130,484,956
Ending balance at Sep. 30, 2019	3,656,466	$ 204	$ 1,305	4,067,529	(36,672)	(386,631)	3,645,735	10,731
Preferred stock, beginning balance (in shares) at Jun. 30, 2019		20,400,000
Common stock, beginning balance (in shares) at Jun. 30, 2019			130,484,956
Beginning balance at Jun. 30, 2019	3,690,274	$ 204	$ 1,305	4,065,672	(28,798)	(358,615)	3,679,768	10,506
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	2,134			1,857			1,857	277
Distributions on common shares/units	(49,909)					(49,768)	(49,768)	(141)
Distributions on preferred shares	(8,139)					(8,139)	(8,139)
Other comprehensive income (loss):
Unrealized gain (loss) on derivative instruments	(7,874)				(7,874)		(7,874)
Net income (loss)	29,980					29,891	29,891	89
Preferred stock, ending balance (in shares) at Sep. 30, 2019		20,400,000
Common stock, ending balance (in shares) at Sep. 30, 2019			130,484,956
Ending balance at Sep. 30, 2019	$ 3,656,466	$ 204	$ 1,305	4,067,529	(36,672)	(386,631)	3,645,735	10,731
Preferred stock, beginning balance (in shares) at Dec. 31, 2019	20,400,000	20,400,000
Common stock, beginning balance (in shares) at Dec. 31, 2019	130,484,956		130,484,956
Beginning balance at Dec. 31, 2019	$ 3,631,936	$ 204	$ 1,305	4,069,410	(24,715)	(424,996)	3,621,208	10,728
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares, net of offering costs	(94)			(94)			(94)
Issuance of common shares for Board of Trustees compensation (in shares)			23,528
Issuance of common shares for Board of Trustees compensation	637		$ 1	636			637
Repurchase of common shares (in shares)			(47,507)
Repurchase of common shares	(1,255)		$ (1)	(1,254)			(1,255)
Share-based compensation (in shares)			103,083
Share-based compensation	21,076		$ 1	10,459			10,460	10,616
Distributions on common shares/units	(3,410)					(3,383)	(3,383)	(27)
Distributions on preferred shares	(24,417)					(24,417)	(24,417)
Redemption of non-controlling interest LTIP units (in shares)			109,240
Redemption of non-controlling interest LTIP units			$ 1	13,445			13,446	(13,446)
Other comprehensive income (loss):
Unrealized gain (loss) on derivative instruments	(44,948)				(44,948)		(44,948)
Net income (loss)	$ (219,406)					(218,871)	(218,871)	(535)
Preferred stock, ending balance (in shares) at Sep. 30, 2020	20,400,000	20,400,000
Common stock, ending balance (in shares) at Sep. 30, 2020	130,673,300		130,673,300
Ending balance at Sep. 30, 2020	$ 3,360,119	$ 204	$ 1,307	4,092,602	(69,663)	(671,667)	3,352,783	7,336
Preferred stock, beginning balance (in shares) at Jun. 30, 2020		20,400,000
Common stock, beginning balance (in shares) at Jun. 30, 2020			130,564,060
Beginning balance at Jun. 30, 2020	3,488,746	$ 204	$ 1,306	4,077,497	(79,385)	(531,914)	3,467,708	21,038
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation (in shares)			0
Share-based compensation	1,660			1,660			1,660
Distributions on common shares/units	(1,310)					(1,307)	(1,307)	(3)
Distributions on preferred shares	(8,139)					(8,139)	(8,139)
Redemption of non-controlling interest LTIP units (in shares)			109,240
Redemption of non-controlling interest LTIP units			$ 1	13,445			13,446	(13,446)
Other comprehensive income (loss):
Unrealized gain (loss) on derivative instruments	9,722				9,722		9,722
Net income (loss)	$ (130,560)					(130,307)	(130,307)	(253)
Preferred stock, ending balance (in shares) at Sep. 30, 2020	20,400,000	20,400,000
Common stock, ending balance (in shares) at Sep. 30, 2020	130,673,300		130,673,300
Ending balance at Sep. 30, 2020	$ 3,360,119	$ 204	$ 1,307	$ 4,092,602	$ (69,663)	$ (671,667)	$ 3,352,783	$ 7,336