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	66,649
Exercise of share options			8	39,615
Employee Share Purchase Plan (ESPP)			1	2,666
Share-based employee compensation expense:
Issuance of restricted units/shares			1	4,813
Share options				1,976
ESPP discount				633
Supplemental Executive Retirement Plan (SERP)				(2,057)
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership	$ 101,966			(101,966)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				(30,807)				30,807
PAID IN CAPITAL
Conversion of OP Units into Common Shares			11	66,649
Exercise of share options			8	39,615
Employee Share Purchase Plan (ESPP)			1	2,666
RETAINED EARNINGS
Net income attributable to controlling interests	373,925				373,925
Common Share distributions					(450,220)
Preferred Share distributions					(1,545)
Accumulated other comprehensive income (loss) - derivative instruments:
Losses reclassified into earnings from other comprehensive income	(4,637)					4,637
DISTRIBUTIONS
Distributions declared per Common Share outstanding							$ 1.205
NONCONTROLLING INTERESTS
Issuance of restricted units/shares			1	4,813
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(66,660)
Equity compensation associated with Noncontrolling Interests								10,531
Net income attributable to Noncontrolling Interests	13,056							13,056	1,423
Distributions to Noncontrolling Interests								(15,999)	(3,731)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	(794)							794
Adjustment for Noncontrolling Interests ownership in Operating Partnership				(30,807)				30,807
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	13,056							13,056	1,423
Distributions to Noncontrolling Interests								(15,999)	(3,731)
Balance, end of period at Jun. 30, 2021		37,280	3,744	9,110,121	1,321,875	(39,029)
Balance, end of period at Jun. 30, 2021								205,691	2,365
Balance, beginning of year at Mar. 31, 2021		37,280	3,729	9,083,346	1,231,808	(41,363)
Balance, beginning of year at Mar. 31, 2021								234,969	2,472
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares			11	66,649
Exercise of share options			3	16,738
Employee Share Purchase Plan (ESPP)			1	935
Share-based employee compensation expense:
Issuance of restricted units/shares				2,540
Share options				988
ESPP discount				189
Supplemental Executive Retirement Plan (SERP)				(828)
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership				(29,010)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				(31,426)				31,426
PAID IN CAPITAL
Conversion of OP Units into Common Shares			11	66,649
Exercise of share options			3	16,738
Employee Share Purchase Plan (ESPP)			1	935
RETAINED EARNINGS
Net income attributable to controlling interests	316,386				316,386
Common Share distributions					(225,547)
Preferred Share distributions					(772)
Accumulated other comprehensive income (loss) - derivative instruments:
Losses reclassified into earnings from other comprehensive income	(2,334)					2,334
DISTRIBUTIONS
Distributions declared per Common Share outstanding							0.6025
NONCONTROLLING INTERESTS
Issuance of restricted units/shares				2,540
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(66,660)
Equity compensation associated with Noncontrolling Interests								4,043
Net income attributable to Noncontrolling Interests	10,913							10,913	741
Distributions to Noncontrolling Interests								(7,410)	(848)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership								(1,590)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				(31,426)				31,426
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	10,913							10,913	741
Distributions to Noncontrolling Interests								(7,410)	(848)
Balance, end of period at Jun. 30, 2021		37,280	3,744	9,110,121	1,321,875	(39,029)
Balance, end of period at Jun. 30, 2021								205,691	2,365
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				1,484
Exercise of share options			4	18,924
Employee Share Purchase Plan (ESPP)				2,378
Share-based employee compensation expense:
Issuance of restricted units/shares			2	7,359				1
Share options				1,390
ESPP discount				420
Offering costs				(487)
Supplemental Executive Retirement Plan (SERP)				(269)
Acquisition of Noncontrolling Interests – Partially Owned Properties				(27,355)					(4,823)
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership	(98,140)			98,140
Adjustment for Noncontrolling Interests ownership in Operating Partnership				6,632				(6,632)
PAID IN CAPITAL
Conversion of OP Units into Common Shares				1,484
Exercise of share options			4	18,924
Employee Share Purchase Plan (ESPP)				2,378
RETAINED EARNINGS
Net income attributable to controlling interests	294,866				294,866
Common Share distributions					(470,424)
Preferred Share distributions					(1,545)
Accumulated other comprehensive income (loss) - derivative instruments:
Unrealized holding gains (losses) arising during the period	(1,259)					(1,259)
Losses reclassified into earnings from other comprehensive income	(4,881)					4,881
DISTRIBUTIONS
Distributions declared per Common Share outstanding							1.25
NONCONTROLLING INTERESTS
Issuance of restricted units/shares			2	7,359				1
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(1,484)
Equity compensation associated with Noncontrolling Interests								13,159
Net income attributable to Noncontrolling Interests	10,027							10,027	1,583
Distributions to Noncontrolling Interests								(15,488)	(17,263)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	(2,649)							2,649
Adjustment for Noncontrolling Interests ownership in Operating Partnership				6,632				(6,632)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	10,027							10,027	1,583
Contributions by Noncontrolling Interests									603
Distributions to Noncontrolling Interests								(15,488)	(17,263)
Acquisition of Noncontrolling Interests – Partially Owned Properties				(27,355)					(4,823)
Balance, end of period at Jun. 30, 2022	10,890,089	37,280	3,761	9,229,738	1,649,960	(30,650)
Balance, end of period at Jun. 30, 2022	214,592							216,326	(1,734)
Balance, beginning of year at Mar. 31, 2022		37,280	3,760	9,142,969	1,661,705	(31,847)
Balance, beginning of year at Mar. 31, 2022								217,451	3,415
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares				1,310
Exercise of share options			1	4,583
Employee Share Purchase Plan (ESPP)				1,409
Share-based employee compensation expense:
Issuance of restricted units/shares				3,750
Share options				514
ESPP discount				249
Offering costs				(373)
Supplemental Executive Retirement Plan (SERP)				(106)
Acquisition of Noncontrolling Interests – Partially Owned Properties				(27,355)					(4,823)
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership				97,201
Adjustment for Noncontrolling Interests ownership in Operating Partnership				5,587				(5,587)
PAID IN CAPITAL
Conversion of OP Units into Common Shares				1,310
Exercise of share options			1	4,583
Employee Share Purchase Plan (ESPP)				1,409
RETAINED EARNINGS
Net income attributable to controlling interests	224,101				224,101
Common Share distributions					(235,073)
Preferred Share distributions					(773)
Accumulated other comprehensive income (loss) - derivative instruments:
Unrealized holding gains (losses) arising during the period	(1,259)					(1,259)
Losses reclassified into earnings from other comprehensive income	(2,456)					2,456
DISTRIBUTIONS
Distributions declared per Common Share outstanding							$ 0.625
NONCONTROLLING INTERESTS
Issuance of restricted units/shares				3,750
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(1,310)
Equity compensation associated with Noncontrolling Interests								5,361
Net income attributable to Noncontrolling Interests	7,633							7,633	944
Distributions to Noncontrolling Interests								(7,593)	(1,427)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership								371
Adjustment for Noncontrolling Interests ownership in Operating Partnership				5,587				(5,587)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	7,633							7,633	944
Contributions by Noncontrolling Interests									157
Distributions to Noncontrolling Interests								(7,593)	(1,427)
Acquisition of Noncontrolling Interests – Partially Owned Properties				(27,355)					(4,823)
Balance, end of period at Jun. 30, 2022	10,890,089	$ 37,280	$ 3,761	$ 9,229,738	$ 1,649,960	$ (30,650)
Balance, end of period at Jun. 30, 2022	$ 214,592							$ 216,326	$ (1,734)