Condensed Consolidated Statements Of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common shares of beneficial interest	Additional paid-in capital	Distributions in excess of net income	Treasury shares, at cost	Accumulated other comprehensive (loss)/income	Non-controlling interests
Cash distributions declared to equity holders per common share	$ 1.66
Beginning balance at Dec. 31, 2020	$ 3,516,587	$ 1,069	$ 4,581,710	$ (791,079)	$ (341,412)	$ (5,383)	$ 71,682
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	63,912			61,526			$ 2,386
Other comprehensive income (loss)	745					745
Proceeds from issuance of common shares	358,843	$ 29	358,814
Net share awards	13,838		7,483		6,355
Employee share purchase plan	$ 3,335		$ 2,439		896
Stock Issued During Period, Shares, Conversion of Units	0	1	3,316				(3,317)
Cash distributions declared to equity holders	$ (170,992)			(168,208)			$ (2,784)
Other	(60)	$ (1)	$ (59)
Ending balance at Jun. 30, 2021	$ 3,786,208	1,098	4,953,703	(897,761)	(334,161)	(4,638)	67,967
Cash distributions declared to equity holders per common share	$ 0.83
Beginning balance at Mar. 31, 2021	$ 3,474,076	1,070	4,588,056	(842,628)	(335,511)	(5,010)	68,099
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	31,439			30,179			1,260
Other comprehensive income (loss)	372					372
Proceeds from issuance of common shares	358,843	29	358,814
Net share awards	4,972		4,518		454
Employee share purchase plan	3,248		2,352		896
Cash distributions declared to equity holders	(86,704)			(85,312)			(1,392)
Other	(38)	(1)	(37)
Ending balance at Jun. 30, 2021	$ 3,786,208	1,098	4,953,703	(897,761)	(334,161)	(4,638)	67,967
Cash distributions declared to equity holders per common share	$ 1.88
Beginning balance at Dec. 31, 2021	$ 4,266,255	1,126	5,363,530	(829,453)	(333,974)	(3,739)	68,765
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	582,487			578,060			4,427
Other comprehensive income (loss)	738					738
Proceeds from issuance of common shares	516,758	30	516,728
Net share awards	15,205		10,383		4,822
Employee share purchase plan	630		453		177
Cash distributions declared to equity holders	(204,491)			(201,472)			(3,019)
Other	(302)		(302)
Ending balance at Jun. 30, 2022	$ 5,177,280	1,156	5,890,792	(452,865)	(328,975)	(3,001)	70,173
Cash distributions declared to equity holders per common share	$ 0.94
Beginning balance at Mar. 31, 2022	$ 4,286,539	1,127	5,396,267	(848,074)	(329,521)	(3,370)	70,110
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	498,886			497,315			1,571
Other comprehensive income (loss)	369					369
Proceeds from issuance of common shares	490,593	29	490,564
Net share awards	4,275		3,906		369
Employee share purchase plan	496		319		177
Cash distributions declared to equity holders	(103,614)			(102,106)			(1,508)
Other	(264)		(264)
Ending balance at Jun. 30, 2022	$ 5,177,280	$ 1,156	$ 5,890,792	$ (452,865)	$ (328,975)	$ (3,001)	$ 70,173