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
Exercise of share options			5	22,877
Employee Share Purchase Plan (ESPP)				1,731
Share-based employee compensation expense:
Issuance of restricted units/shares			1	2,273
Share options				988
ESPP discount				444
Supplemental Executive Retirement Plan (SERP)				(1,229)
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership	$ 72,956			(72,956)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				619				(619)
PAID IN CAPITAL
Exercise of share options			5	22,877
Employee Share Purchase Plan (ESPP)				1,731
RETAINED EARNINGS
Net income attributable to controlling interests	57,539				57,539
Common Share distributions					(224,673)
Preferred Share distributions					(773)
Accumulated other comprehensive income (loss) - derivative instruments:
Losses reclassified into earnings from other comprehensive income	(2,303)					2,303
DISTRIBUTIONS
Distributions declared per Common Share outstanding							$ 0.6025
NONCONTROLLING INTERESTS
Issuance of restricted units/shares			1	2,273
Equity compensation associated with Noncontrolling Interests								6,488
Net income attributable to Noncontrolling Interests	2,143							2,143	682
Distributions to Noncontrolling Interests								(8,589)	(2,883)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	(2,384)							2,384
Adjustment for Noncontrolling Interests ownership in Operating Partnership				619				(619)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	2,143							2,143	682
Distributions to Noncontrolling Interests								(8,589)	(2,883)
Balance, end of period at Mar. 31, 2021		37,280	3,729	9,083,346	1,231,808	(41,363)
Balance, end of period at Mar. 31, 2021								234,969	2,472
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				174
Exercise of share options			3	14,341
Employee Share Purchase Plan (ESPP)				969
Share-based employee compensation expense:
Issuance of restricted units/shares			2	3,609				1
Share options				876
ESPP discount				171
Offering costs				(114)
Supplemental Executive Retirement Plan (SERP)				(163)
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership	(939)			939
Adjustment for Noncontrolling Interests ownership in Operating Partnership				1,045				(1,045)
PAID IN CAPITAL
Conversion of OP Units into Common Shares				174
Exercise of share options			3	14,341
Employee Share Purchase Plan (ESPP)				969
RETAINED EARNINGS
Net income attributable to controlling interests	70,765				70,765
Common Share distributions					(235,351)
Preferred Share distributions					(772)
Accumulated other comprehensive income (loss) - derivative instruments:
Losses reclassified into earnings from other comprehensive income	(2,425)					2,425
DISTRIBUTIONS
Distributions declared per Common Share outstanding							$ 0.625
NONCONTROLLING INTERESTS
Issuance of restricted units/shares			2	3,609				1
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(174)
Equity compensation associated with Noncontrolling Interests								7,798
Net income attributable to Noncontrolling Interests	2,394							2,394	639
Distributions to Noncontrolling Interests								(7,895)	(15,836)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	(2,278)							2,278
Adjustment for Noncontrolling Interests ownership in Operating Partnership				1,045				(1,045)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	2,394							2,394	639
Contributions by Noncontrolling Interests									446
Distributions to Noncontrolling Interests								(7,895)	(15,836)
Balance, end of period at Mar. 31, 2022	10,813,867	$ 37,280	$ 3,760	$ 9,142,969	$ 1,661,705	$ (31,847)
Balance, end of period at Mar. 31, 2022	$ 220,866							$ 217,451	$ 3,415