CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	PREFERRED SHARES	COMMON SHARES, $0.01 PAR VALUE	PAID IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	DISTRIBUTIONS	OPERATING PARTNERSHIP	PARTIALLY OWNED PROPERTIES
Balance, beginning of year at Dec. 31, 2018		$ 37,280	$ 3,694	$ 8,935,453	$ 1,261,763	$ (64,986)
Balance, beginning of year at Dec. 31, 2018								$ 228,738	$ (2,293)
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares			3	10,407
Exercise of share options			17	77,768
Employee Share Purchase Plan (ESPP)			1	3,115
Share-based employee compensation expense:
Issuance of restricted units/shares			2	12,436				2
Share options				2,675
ESPP discount				642
Offering costs				(991)
Supplemental Executive Retirement Plan (SERP)				(1,675)
Change in market value of Redeemable Noncontrolling Interests –Operating Partnership	$ 82,283			(82,283)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				8,030				(8,030)
PAID IN CAPITAL
Conversion of OP Units into Common Shares			3	10,407
Exercise of share options			17	77,768
Employee Share Purchase Plan (ESPP)			1	3,115
RETAINED EARNINGS
Net income attributable to controlling interests	970,377				970,377
Common Share distributions					(842,555)
Preferred Share distributions					(3,090)
Accumulated other comprehensive income (loss) - derivative instruments:
Unrealized holding gains (losses) arising during the year	(33,765)					(33,765)
Losses reclassified into earnings from other comprehensive income	(21,188)					21,188
DISTRIBUTIONS
Distributions declared per Common Share outstanding							$ 2.27
NONCONTROLLING INTERESTS
Issuance of restricted units/shares			2	12,436				2
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(10,410)
Equity compensation associated with Noncontrolling Interests								13,410
Net income attributable to Noncontrolling Interests	36,034							36,034	3,297
Distributions to Noncontrolling Interests								(29,896)	(7,158)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	2,011							(2,011)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				8,030				(8,030)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	36,034							36,034	3,297
Contributions by Noncontrolling Interests									7,337
Distributions to Noncontrolling Interests								(29,896)	(7,158)
Balance, end of year at Dec. 31, 2019		37,280	3,717	8,965,577	1,386,495	(77,563)
Balance, end of year at Dec. 31, 2019								227,837	1,183
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares			1	4,695
Exercise of share options			2	12,273
Employee Share Purchase Plan (ESPP)			1	4,507
Share-based employee compensation expense:
Issuance of restricted units/shares			2	11,223				13
Share options				2,349
ESPP discount				944
Supplemental Executive Retirement Plan (SERP)				(395)
Change in market value of Redeemable Noncontrolling Interests –Operating Partnership	(125,224)			125,224
Adjustment for Noncontrolling Interests ownership in Operating Partnership				2,202				(2,202)
PAID IN CAPITAL
Conversion of OP Units into Common Shares			1	4,695
Exercise of share options			2	12,273
Employee Share Purchase Plan (ESPP)			1	4,507
RETAINED EARNINGS
Net income attributable to controlling interests	913,636				913,636
Common Share distributions					(897,326)
Preferred Share distributions					(3,090)
Accumulated other comprehensive income (loss) - derivative instruments:
Unrealized holding gains (losses) arising during the year	(1,190)					(1,190)
Losses reclassified into earnings from other comprehensive income	(35,087)					35,087
DISTRIBUTIONS
Distributions declared per Common Share outstanding							2.41
NONCONTROLLING INTERESTS
Issuance of restricted units/shares			2	11,223				13
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(4,696)
Equity compensation associated with Noncontrolling Interests								11,926
Net income attributable to Noncontrolling Interests	34,010							34,010	14,855
Distributions to Noncontrolling Interests								(32,951)	(11,782)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	775							(775)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				2,202				(2,202)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	34,010							34,010	14,855
Contributions by Noncontrolling Interests									417
Distributions to Noncontrolling Interests								(32,951)	(11,782)
Balance, end of year at Dec. 31, 2020	10,525,651	37,280	3,723	9,128,599	1,399,715	(43,666)
Balance, end of year at Dec. 31, 2020	237,835							233,162	4,673
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares			13	74,050
Exercise of share options			17	85,428
Employee Share Purchase Plan (ESPP)			1	4,264
Share-based employee compensation expense:
Issuance of restricted units/shares			1	8,388
Share options				3,101
ESPP discount				991
Offering costs				(428)
Supplemental Executive Retirement Plan (SERP)				(1,335)
Change in market value of Redeemable Noncontrolling Interests –Operating Partnership	158,598			(158,598)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				(23,338)				23,338
PAID IN CAPITAL
Conversion of OP Units into Common Shares			13	74,050
Exercise of share options			17	85,428
Employee Share Purchase Plan (ESPP)			1	4,264
RETAINED EARNINGS
Net income attributable to controlling interests	1,332,850				1,332,850
Common Share distributions					(902,412)
Preferred Share distributions					(3,090)
Accumulated other comprehensive income (loss) - derivative instruments:
Losses reclassified into earnings from other comprehensive income	(9,394)					9,394
DISTRIBUTIONS
Distributions declared per Common Share outstanding							$ 2.41
NONCONTROLLING INTERESTS
Issuance of restricted units/shares			1	8,388
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(74,063)
Equity compensation associated with Noncontrolling Interests								17,797
Net income attributable to Noncontrolling Interests	45,900							45,900	17,964
Distributions to Noncontrolling Interests								(30,612)	(5,865)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	1,428							(1,428)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				(23,338)				23,338
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	45,900							45,900	17,964
Contributions by Noncontrolling Interests									1,394
Distributions to Noncontrolling Interests								(30,612)	(5,865)
Balance, end of year at Dec. 31, 2021	10,954,948	$ 37,280	$ 3,755	$ 9,121,122	$ 1,827,063	$ (34,272)
Balance, end of year at Dec. 31, 2021	$ 232,260							$ 214,094	$ 18,166