CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Distributions in Excess of Accumulated Earnings	Total Common Shareholders' Equity	Noncontrolling Interests
Balance at Dec. 31, 2018	$ 2,081,947	$ 82	$ 1,548,603	$ 516	$ (89,696)	$ 1,459,505	$ 622,442
Balance (in Shares) at Dec. 31, 2018		81,557,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership	0		3,510			3,510	(3,510)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares)		208,000
Issuance of Common Shares	75,115	$ 2	75,113			75,115
Issuance of Common Shares		2,667,000
Dividends/distributions declared ($0, $0.28, $0.29 and $0.56 per Common Share/OP Unit for Three Months and Six Months Ended June 30, 2020 and 2019)	(50,362)				(46,805)	(46,805)	(3,557)
Employee and trustee stock compensation, net	5,442		247			247	5,195
Employee and trustee stock compensation, net (in Shares)		21,000
Noncontrolling interest distributions	(4,882)						(4,882)
Noncontrolling interest contributions	32,191						32,191
Comprehensive (loss) income	(39,345)			(30,086)	21,277	(8,809)	(30,536)
Reallocation of noncontrolling interests	0		(1,567)			(1,567)	1,567
Balance at Jun. 30, 2019	2,100,106	$ 84	1,625,906	(29,570)	(115,224)	1,481,196	618,910
Balance (in Shares) at Jun. 30, 2019		84,453,000
Balance at Dec. 31, 2018	$ 2,081,947	$ 82	1,548,603	516	(89,696)	1,459,505	622,442
Balance (in Shares) at Dec. 31, 2018		81,557,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of Common Shares (in shares)	0
Balance at Dec. 31, 2019	$ 2,186,965	$ 87	1,706,357	(31,175)	(132,961)	1,542,308	644,657
Balance (in Shares) at Dec. 31, 2019	87,050,465	87,050,000
Balance at Mar. 31, 2019	$ 2,106,352	$ 83	1,577,503	(11,021)	(100,634)	1,465,931	640,421
Balance (in Shares) at Mar. 31, 2019		82,708,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership	0		557			557	(557)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares)		33,000
Issuance of Common Shares	47,281	$ 1	47,280			47,281
Issuance of Common Shares		1,697,000
Dividends/distributions declared ($0, $0.28, $0.29 and $0.56 per Common Share/OP Unit for Three Months and Six Months Ended June 30, 2020 and 2019)	(25,446)				(23,670)	(23,670)	(1,776)
Employee and trustee stock compensation, net	1,988		153			153	1,835
Employee and trustee stock compensation, net (in Shares)		15,000
Noncontrolling interest distributions	(1,645)						(1,645)
Noncontrolling interest contributions							0
Comprehensive (loss) income	(28,424)			(18,549)	9,080	(9,469)	(18,955)
Reallocation of noncontrolling interests	0		413			413	(413)
Balance at Jun. 30, 2019	2,100,106	$ 84	1,625,906	(29,570)	(115,224)	1,481,196	618,910
Balance (in Shares) at Jun. 30, 2019		84,453,000
Balance at Dec. 31, 2019	$ 2,186,965	$ 87	1,706,357	(31,175)	(132,961)	1,542,308	644,657
Balance (in Shares) at Dec. 31, 2019	87,050,465	87,050,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle	$ (400)				(389)	(389)	(11)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership	0		6,544			6,544	(6,544)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares)		408,000
Acquisition of noncontrolling interest	588						588
Repurchase of Common Shares	$ (22,386)	$ (1)	(22,385)			(22,386)
Repurchase of Common Shares (in shares)	(1,219,065)	(1,219,000)
Dividends/distributions declared ($0, $0.28, $0.29 and $0.56 per Common Share/OP Unit for Three Months and Six Months Ended June 30, 2020 and 2019)	$ (26,909)				(24,937)	(24,937)	(1,972)
Employee and trustee stock compensation, net	6,136		346			346	5,790
Employee and trustee stock compensation, net (in Shares)		26,000
Noncontrolling interest distributions	(4,536)						(4,536)
Noncontrolling interest contributions	28,309						28,309
Comprehensive (loss) income	(74,436)			(59,034)	10,996	(48,038)	(26,398)
Reallocation of noncontrolling interests	0		2,144			2,144	(2,144)
Balance at Jun. 30, 2020	$ 2,093,331	$ 86	1,693,006	(90,209)	(147,291)	1,455,592	637,739
Balance (in Shares) at Jun. 30, 2020	86,264,641	86,265,000
Balance at Mar. 31, 2020	$ 2,011,560	$ 86	1,686,794	(85,715)	(166,701)	1,434,464	577,096
Balance (in Shares) at Mar. 31, 2020		85,990,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership	0		4,072			4,072	(4,072)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares)		260,000
Acquisition of noncontrolling interest	588						588
Issuance of Common Shares	(34)		(34)			(34)
Dividends/distributions declared ($0, $0.28, $0.29 and $0.56 per Common Share/OP Unit for Three Months and Six Months Ended June 30, 2020 and 2019)	(123)						(123)
Employee and trustee stock compensation, net	2,317		175			175	2,142
Employee and trustee stock compensation, net (in Shares)		15,000
Noncontrolling interest distributions	(1,418)						(1,418)
Noncontrolling interest contributions	21,041						21,041
Comprehensive (loss) income	59,400			(4,494)	19,410	14,916	44,484
Reallocation of noncontrolling interests	0		1,999			1,999	(1,999)
Balance at Jun. 30, 2020	$ 2,093,331	$ 86	$ 1,693,006	$ (90,209)	$ (147,291)	$ 1,455,592	$ 637,739
Balance (in Shares) at Jun. 30, 2020	86,264,641	86,265,000