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, 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			$ (1)	(4,008)			(4,009)
Share-based compensation (in shares)			275,066
Share-based compensation	1,848		$ 2	1,570			1,572	276
Distribution on common shares/units	(49,912)					(49,771)	(49,771)	(141)
Distribution on preferred shares	(8,139)					(8,139)	(8,139)
Other comprehensive income (loss):
Unrealized gain (loss) on derivative instruments	(9,039)				(9,039)		(9,039)
Net income (loss)	5,655					5,635	5,635	20
Preferred stock, ending balance (in shares) at Mar. 31, 2019		20,400,000
Common stock, ending balance (in shares) at Mar. 31, 2019			130,484,956
Ending balance at Mar. 31, 2019	$ 3,706,799	$ 204	$ 1,305	4,063,830	(7,709)	(361,081)	3,696,549	10,250
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, offering costs	(85)			(85)			(85)
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)			102,249
Share-based compensation	17,637		$ 1	7,020			7,021	10,616
Distribution on common shares/units	(768)					(764)	(764)	(4)
Distribution on preferred shares	(8,139)					(8,139)	(8,139)
Other comprehensive income (loss):
Unrealized gain (loss) on derivative instruments	(54,265)				(54,265)		(54,265)
Net income (loss)	$ 42,068					41,949	41,949	119
Preferred stock, ending balance (in shares) at Mar. 31, 2020	20,400,000	20,400,000
Common stock, ending balance (in shares) at Mar. 31, 2020	130,563,226		130,563,226
Ending balance at Mar. 31, 2020	$ 3,627,766	$ 204	$ 1,306	$ 4,075,727	$ (78,980)	$ (391,950)	$ 3,606,307	$ 21,459