CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - 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, 2020		$ 37,280	$ 3,723	$ 9,128,599	$ 1,399,715	$ (43,666)
Balance, beginning of year at Dec. 31, 2020								$ 233,162	$ 4,673
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares			11	68,246
Exercise of share options			14	68,793
Employee Share Purchase Plan (ESPP)			1	3,454
Share-based employee compensation expense:
Issuance of restricted units/shares			1	6,571
Share options				2,541
ESPP discount				798
Offering costs				(267)
Supplemental Executive Retirement Plan (SERP)				1,335
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership	$ 119,237			(119,237)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				(27,085)				27,085
PAID IN CAPITAL
Conversion of OP Units into Common Shares			11	68,246
Exercise of share options			14	68,793
Employee Share Purchase Plan (ESPP)			1	3,454
RETAINED EARNINGS
Net income attributable to controlling interests	805,876				805,876
Common Share distributions					(676,158)
Preferred Share distributions					(2,318)
Accumulated other comprehensive income (loss) - derivative instruments:
Losses reclassified into earnings from other comprehensive income	(7,000)					7,000
DISTRIBUTIONS
Distributions declared per Common Share outstanding							$ 1.8075
NONCONTROLLING INTERESTS
Issuance of restricted units/shares			1	6,571
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(68,257)
Equity compensation associated with Noncontrolling Interests								14,173
Net income attributable to Noncontrolling Interests	27,903							27,903	1,957
Distributions to Noncontrolling Interests								(23,366)	(4,492)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	(1,745)							(1,745)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				(27,085)				27,085
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	27,903							27,903	1,957
Distributions to Noncontrolling Interests								(23,366)	(4,492)
Balance, end of period at Sep. 30, 2021		37,280	3,750	9,131,078	1,527,115	(36,666)
Balance, end of period at Sep. 30, 2021								208,955	2,138
Balance, beginning of year at Jun. 30, 2021		37,280	3,744	9,110,121	1,321,875	(39,029)
Balance, beginning of year at Jun. 30, 2021								205,691	2,365
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares				1,597
Exercise of share options			6	29,178
Employee Share Purchase Plan (ESPP)				788
Share-based employee compensation expense:
Issuance of restricted units/shares				1,758
Share options				565
ESPP discount				165
Offering costs				(267)
Supplemental Executive Retirement Plan (SERP)				722
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership				(17,271)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				3,722				(3,722)
PAID IN CAPITAL
Conversion of OP Units into Common Shares				1,597
Exercise of share options			6	29,178
Employee Share Purchase Plan (ESPP)				788
RETAINED EARNINGS
Net income attributable to controlling interests	431,951				431,951
Common Share distributions					(225,938)
Preferred Share distributions					(773)
Accumulated other comprehensive income (loss) - derivative instruments:
Losses reclassified into earnings from other comprehensive income	(2,363)					2,363
DISTRIBUTIONS
Distributions declared per Common Share outstanding							0.6025
NONCONTROLLING INTERESTS
Issuance of restricted units/shares				1,758
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(1,597)
Equity compensation associated with Noncontrolling Interests								3,642
Net income attributable to Noncontrolling Interests	14,847							14,847	534
Distributions to Noncontrolling Interests								(7,367)	(761)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership								(2,539)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				3,722				(3,722)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	14,847							14,847	534
Distributions to Noncontrolling Interests								(7,367)	(761)
Balance, end of period at Sep. 30, 2021		37,280	3,750	9,131,078	1,527,115	(36,666)
Balance, end of period at Sep. 30, 2021								208,955	2,138
Balance, beginning of year at Dec. 31, 2021	10,954,948	37,280	3,755	9,121,122	1,827,063	(34,272)
Balance, beginning of year at Dec. 31, 2021	232,260							214,094	18,166
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares				1,680
Exercise of share options			4	21,017
Employee Share Purchase Plan (ESPP)			1	3,279
Share-based employee compensation expense:
Issuance of restricted units/shares			2	9,524				1
Share options				1,856
ESPP discount				637
Offering costs				(739)
Supplemental Executive Retirement Plan (SERP)				269
Acquisition of Noncontrolling Interests – Partially Owned Properties				(27,383)					(4,795)
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership	(127,570)			127,570
Adjustment for Noncontrolling Interests ownership in Operating Partnership				9,156				(9,156)
PAID IN CAPITAL
Conversion of OP Units into Common Shares				1,680
Exercise of share options			4	21,017
Employee Share Purchase Plan (ESPP)			1	3,279
RETAINED EARNINGS
Net income attributable to controlling interests	617,891				617,891
Common Share distributions					(705,529)
Preferred Share distributions					(2,318)
Accumulated other comprehensive income (loss) - derivative instruments:
Unrealized holding gains (losses) arising during the period	23,413					23,413
Losses reclassified into earnings from other comprehensive income	(9,987)					9,987
DISTRIBUTIONS
Distributions declared per Common Share outstanding							1.875
NONCONTROLLING INTERESTS
Issuance of restricted units/shares			2	9,524				1
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(1,680)
Equity compensation associated with Noncontrolling Interests								16,502
Net income attributable to Noncontrolling Interests	21,024							21,024	2,726
Distributions to Noncontrolling Interests								(23,078)	(18,267)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	(870)							870
Adjustment for Noncontrolling Interests ownership in Operating Partnership				9,156				(9,156)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	21,024							21,024	2,726
Contributions by Noncontrolling Interests									603
Distributions to Noncontrolling Interests								(23,078)	(18,267)
Acquisition of Noncontrolling Interests – Partially Owned Properties				(27,383)					(4,795)
Balance, end of period at Sep. 30, 2022	11,044,727	37,280	3,762	9,267,450	1,737,107	(872)
Balance, end of period at Sep. 30, 2022	217,010							218,577	(1,567)
Balance, beginning of year at Jun. 30, 2022		37,280	3,761	9,229,738	1,649,960	(30,650)
Balance, beginning of year at Jun. 30, 2022								216,326	(1,734)
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares				196
Exercise of share options				2,093
Employee Share Purchase Plan (ESPP)			1	901
Share-based employee compensation expense:
Issuance of restricted units/shares				2,165
Share options				466
ESPP discount				217
Offering costs				(252)
Acquisition of Noncontrolling Interests – Partially Owned Properties				(28)					28
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership				29,430
Adjustment for Noncontrolling Interests ownership in Operating Partnership				2,524				(2,524)
PAID IN CAPITAL
Conversion of OP Units into Common Shares				196
Exercise of share options				2,093
Employee Share Purchase Plan (ESPP)			1	901
RETAINED EARNINGS
Net income attributable to controlling interests	323,025				323,025
Common Share distributions					(235,105)
Preferred Share distributions					(773)
Accumulated other comprehensive income (loss) - derivative instruments:
Unrealized holding gains (losses) arising during the period	24,672
Losses reclassified into earnings from other comprehensive income	(5,106)					5,106
DISTRIBUTIONS
Distributions declared per Common Share outstanding							$ 0.625
NONCONTROLLING INTERESTS
Issuance of restricted units/shares				2,165
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(196)
Equity compensation associated with Noncontrolling Interests								3,343
Net income attributable to Noncontrolling Interests	10,997							10,997	1,143
Distributions to Noncontrolling Interests								(7,590)	(1,004)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership								(1,779)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				2,524				(2,524)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	10,997							10,997	1,143
Distributions to Noncontrolling Interests								(7,590)	(1,004)
Acquisition of Noncontrolling Interests – Partially Owned Properties				(28)					28
Balance, end of period at Sep. 30, 2022	11,044,727	$ 37,280	$ 3,762	$ 9,267,450	$ 1,737,107	$ (872)
Balance, end of period at Sep. 30, 2022	$ 217,010							$ 218,577	$ (1,567)