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	$ 2.49
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	94,517			91,009			$ 3,508
Other comprehensive income (loss)	1,117					1,117
Proceeds from issuance of common shares	579,518	$ 43	579,475
Net share awards	17,809		11,359		6,450
Employee share purchase plan	$ 3,368		$ 2,472		896
Stock Issued During Period, Shares, Conversion of Units	0	1	5,935				(5,936)
Cash distributions declared to equity holders	$ (258,927)			(254,810)			$ (4,117)
Other	(167)	$ 1	$ (168)
Ending balance at Sep. 30, 2021	$ 3,953,822	1,114	5,180,783	(954,880)	(334,066)	(4,266)	65,137
Cash distributions declared to equity holders per common share	$ 0.83
Beginning balance at Jun. 30, 2021	$ 3,786,208	1,098	4,953,703	(897,761)	(334,161)	(4,638)	67,967
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	30,605			29,483			$ 1,122
Other comprehensive income (loss)	372					372
Proceeds from issuance of common shares	220,675	14	220,661
Net share awards	3,971		3,876		95
Employee share purchase plan	$ 33		$ 33
Stock Issued During Period, Shares, Conversion of Units	0		2,619				(2,619)
Cash distributions declared to equity holders	$ (87,935)			(86,602)			$ (1,333)
Other	(107)	2	$ (109)
Ending balance at Sep. 30, 2021	$ 3,953,822	1,114	5,180,783	(954,880)	(334,066)	(4,266)	65,137
Cash distributions declared to equity holders per common share	$ 2.82
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	614,037			607,904			6,133
Other comprehensive income (loss)	1,107					1,107
Proceeds from issuance of common shares	516,758	30	516,728
Net share awards	18,004		13,207		4,797
Employee share purchase plan	752		575		177
Cash distributions declared to equity holders	(308,107)			(303,578)			(4,529)
Other	(444)		(417)		(27)
Ending balance at Sep. 30, 2022	$ 5,108,362	1,156	5,893,623	(525,127)	(329,027)	(2,632)	70,369
Cash distributions declared to equity holders per common share	$ 0.94
Beginning balance at Jun. 30, 2022	$ 5,177,280	1,156	5,890,792	(452,865)	(328,975)	(3,001)	70,173
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	31,550			29,844			1,706
Other comprehensive income (loss)	369					369
Net share awards	2,799		2,824		(25)
Employee share purchase plan	122		122
Cash distributions declared to equity holders	(103,616)			(102,106)			(1,510)
Other	(142)		(115)		(27)
Ending balance at Sep. 30, 2022	$ 5,108,362	$ 1,156	$ 5,893,623	$ (525,127)	$ (329,027)	$ (2,632)	$ 70,369