CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect of Change in Accounting Principle	Common Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Distributions in Excess of Accumulated Earnings	Distributions in Excess of Accumulated Earnings Cumulative Effect of Change in Accounting Principle	Total Common Shareholders' Equity	Total Common Shareholders' Equity Cumulative Effect of Change in Accounting Principle	Noncontrolling Interest [Member]		Noncontrolling Interest [Member] Cumulative Effect of Change in Accounting Principle
Balance at Dec. 31, 2018	$ 2,082,757		$ 82	$ 1,548,603	$ 516	$ (90,426)		$ 1,458,775		$ 623,982
Balance (in Shares) at Dec. 31, 2018			81,557,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Shares	145,498		$ 5	145,493				145,498
Issuance of Common Shares (in Shares)			5,164,000
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership				5,104				5,104		(5,104)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares)			308,000
Repurchase of Common Shares	$ 0							0
Repurchase of Common Shares (in shares)	0
Dividends/distributions declared	$ (103,434)					(96,310)		(96,310)		(7,124)
Employee and trustee stock compensation, net	10,006			546				546		9,460
Employee and trustee stock compensation, net (in Shares)			21,000
Noncontrolling interest distributions	(94,283)									(94,283)
Noncontrolling interest contributions	161,365									161,365
Comprehensive (loss) income	(13,519)				(31,990)	53,717		21,727		(35,246)
Reallocation of noncontrolling interests				6,611				6,611		(6,611)	[1]
Balance at Dec. 31, 2019	$ 2,188,390	$ (400)	$ 87	1,706,357	(31,474)	(133,019)	$ (389)	1,541,951	$ (389)	646,439		$ (11)
Balance (in Shares) at Dec. 31, 2019	87,050,465		87,050,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of Common Shares	$ (22,400)
Repurchase of Common Shares (in shares)	(1,219,065)
Balance (in Shares) at Mar. 31, 2020	85,989,836
Balance at Dec. 31, 2019	$ 2,188,390	(400)	$ 87	1,706,357	(31,474)	(133,019)	(389)	1,541,951	(389)	646,439		(11)
Balance (in Shares) at Dec. 31, 2019	87,050,465		87,050,000
Balance (in Shares) at Jun. 30, 2020	86,264,641
Balance at Dec. 31, 2019	$ 2,188,390	(400)	$ 87	1,706,357	(31,474)	(133,019)	(389)	1,541,951	(389)	646,439		(11)
Balance (in Shares) at Dec. 31, 2019	87,050,465		87,050,000
Balance (in Shares) at Sep. 30, 2020	86,266,122
Balance at Dec. 31, 2019	$ 2,188,390	$ (400)	$ 87	1,706,357	(31,474)	(133,019)	$ (389)	1,541,951	$ (389)	646,439		$ (11)
Balance (in Shares) at Dec. 31, 2019	87,050,465		87,050,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Acquisition of noncontrolling interest	$ 588			(15,330)				(15,330)		15,918
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership				6,544				6,544		(6,544)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares)			408,000
Repurchase of Common Shares	(22,386)		$ (1)	(22,385)				(22,386)
Repurchase of Common Shares (in shares)			(1,219,000)
Dividends/distributions declared	(27,155)					(24,937)		(24,937)		(2,218)
Employee and trustee stock compensation, net	10,912			782				782		10,130
Employee and trustee stock compensation, net (in Shares)			30,000
Noncontrolling interest distributions	(27,574)									(27,574)
Noncontrolling interest contributions	52,174									52,174
Comprehensive (loss) income	(124,345)				(43,417)	(8,976)		(52,393)		(71,952)
Reallocation of noncontrolling interests				7,197				7,197		(7,197)
Balance at Dec. 31, 2020	$ 2,050,204		$ 86	1,683,165	(74,891)	(167,321)		1,441,039		609,165
Balance (in Shares) at Dec. 31, 2020	86,268,303		86,269,000
Balance (in Shares) at Mar. 31, 2020	85,989,836
Balance (in Shares) at Jun. 30, 2020	86,264,641
Balance (in Shares) at Sep. 30, 2020	86,266,122
Balance (in Shares) at Dec. 31, 2020	86,268,303		86,269,000
Balance (in Shares) at Mar. 31, 2021	86,302,352
Balance at Dec. 31, 2020	$ 2,050,204		$ 86	1,683,165	(74,891)	(167,321)		1,441,039		609,165
Balance (in Shares) at Dec. 31, 2020	86,268,303		86,269,000
Balance (in Shares) at Jun. 30, 2021	88,419,303
Balance at Dec. 31, 2020	$ 2,050,204		$ 86	1,683,165	(74,891)	(167,321)		1,441,039		609,165
Balance (in Shares) at Dec. 31, 2020	86,268,303		86,269,000
Balance (in Shares) at Sep. 30, 2021	88,451,668
Balance at Dec. 31, 2020	$ 2,050,204		$ 86	1,683,165	(74,891)	(167,321)		1,441,039		609,165
Balance (in Shares) at Dec. 31, 2020	86,268,303		86,269,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Shares	$ 63,876		$ 3	63,873				63,876
Issuance of Common Shares (in Shares)			2,889,000
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership				1,431				1,431		(1,431)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares)			90,000
Cancellation of OP Units	(568)									(568)
Dividends/distributions declared	(57,057)					(52,872)		(52,872)		(4,185)
Employee and trustee stock compensation, net	12,430			1,146				1,146		11,284
Employee and trustee stock compensation, net (in Shares)			56,000
Noncontrolling interest distributions	(27,051)									(27,051)
Noncontrolling interest contributions	30,164									30,164
Comprehensive (loss) income	77,937				38,677	23,548		62,225		15,712
Reallocation of noncontrolling interests				4,768				4,768		(4,768)
Balance at Dec. 31, 2021	$ 2,149,935		$ 89	$ 1,754,383	$ (36,214)	$ (196,645)		$ 1,521,613		$ 628,322
Balance (in Shares) at Dec. 31, 2021	89,303,545		89,304,000
Balance (in Shares) at Mar. 31, 2021	86,302,352
Balance (in Shares) at Jun. 30, 2021	88,419,303
Balance (in Shares) at Sep. 30, 2021	88,451,668

[1] Adjustment reflects the difference between the fair value of the consideration received or paid and the book value of the Common Shares, Common OP Units, Preferred OP Units, and LTIP Units involving changes in ownership.