CONDENSED CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Thousands	Preferred Stock [Member] Series A Preferred Stock [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member] Series A Preferred Stock [Member]	Additional Paid-in Capital [Member]	Dividends in excess of net income [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Series A Preferred Stock [Member]	Total
Balance at Dec. 31, 2019			$ 5		$ 1,752,912	$ (57,094)	$ (6,492)	$ 2,231		$ 1,691,562
Balance (in shares) at Dec. 31, 2019			45,573,623
Issuance of common stock, net of issuance costs					104,615					104,615
Issuance of common stock, net of issuance costs (in shares)			1,400,251
Issuance of Series A preferred stock, net of issuance costs					104,615					104,615
Issuance of Series A preferred stock, net of issuance costs (in shares)			1,400,251
Repurchase of common shares					(1,627)					(1,627)
Repurchase of common shares (in shares)			(20,707)
Issuance of restricted stock under the Omnibus Incentive Plan (in shares)			48,942
Stock-based compensation					1,014					1,014
Dividends and distributions declared for the period						(26,677)		(203)		(26,880)
Other comprehensive income (loss) - change in fair value and settlement of interest rate swaps							(32,799)	(243)		(33,042)
Net income						21,229		141		21,370
Balance at Mar. 31, 2020			$ 5		1,856,914	(62,542)	(39,291)	1,926		1,757,012
Balance (in shares) at Mar. 31, 2020			47,002,109
Balance at Dec. 31, 2019			$ 5		1,752,912	(57,094)	(6,492)	2,231		1,691,562
Balance (in shares) at Dec. 31, 2019			45,573,623
Net income										68,210
Balance at Sep. 30, 2020			$ 6		2,384,331	(80,627)	(40,140)	1,817		2,265,387
Balance (in shares) at Sep. 30, 2020			55,370,525
Balance at Dec. 31, 2019			$ 5		1,752,912	(57,094)	(6,492)	2,231		1,691,562
Balance (in shares) at Dec. 31, 2019			45,573,623
Balance at Dec. 31, 2020			$ 6		2,652,090	(91,343)	(36,266)	1,762		2,526,249
Balance (in shares) at Dec. 31, 2020			60,021,483
Balance at Mar. 31, 2020			$ 5		1,856,914	(62,542)	(39,291)	1,926		1,757,012
Balance (in shares) at Mar. 31, 2020			47,002,109
Issuance of common stock, net of issuance costs					437,100					437,100
Issuance of common stock, net of issuance costs (in shares)			6,851,695
Issuance of Series A preferred stock, net of issuance costs					437,100					437,100
Issuance of Series A preferred stock, net of issuance costs (in shares)			6,851,695
Repurchase of common shares					(3)					(3)
Repurchase of common shares (in shares)			(51)
Forfeiture of restricted stock (in shares)			(2,661)
Stock-based compensation					1,224					1,224
Dividends and distributions declared for the period						(32,311)		(209)		(32,520)
Other comprehensive income (loss) - change in fair value and settlement of interest rate swaps							(2,253)	(8)		(2,261)
Net income						25,258		166		25,424
Balance at Jun. 30, 2020			$ 5		2,295,235	(69,595)	(41,544)	1,875		2,185,976
Balance (in shares) at Jun. 30, 2020			53,851,092
Issuance of common stock, net of issuance costs			$ 1		87,870					87,871
Issuance of common stock, net of issuance costs (in shares)			1,515,000
Issuance of Series A preferred stock, net of issuance costs			$ 1		87,870					87,871
Issuance of Series A preferred stock, net of issuance costs (in shares)			1,515,000
Repurchase of common shares					(7)					(7)
Repurchase of common shares (in shares)			(108)
Issuance of stock under the Omnibus Incentive Plan (in shares)			4,541
Stock-based compensation					1,233					1,233
Dividends and distributions declared for the period						(32,312)		(210)		(32,522)
Other comprehensive income (loss) - change in fair value and settlement of interest rate swaps							1,404	16		1,420
Net income						21,280		136		21,416
Balance at Sep. 30, 2020			$ 6		2,384,331	(80,627)	(40,140)	1,817		2,265,387
Balance (in shares) at Sep. 30, 2020			55,370,525
Balance at Dec. 31, 2020			$ 6		2,652,090	(91,343)	(36,266)	1,762		2,526,249
Balance (in shares) at Dec. 31, 2020			60,021,483
Issuance of common stock, net of issuance costs					258,105					258,105
Issuance of common stock, net of issuance costs (in shares)			4,028,410
Issuance of Series A preferred stock, net of issuance costs					258,105					258,105
Issuance of Series A preferred stock, net of issuance costs (in shares)			4,028,410
Repurchase of common shares					(1,780)					(1,780)
Repurchase of common shares (in shares)			(27,594)
Issuance of restricted stock under the Omnibus Incentive Plan					298					298
Issuance of restricted stock under the Omnibus Incentive Plan (in shares)			128,066
Forfeiture of restricted stock					(92)					(92)
Forfeiture of restricted stock (in shares)			(4,587)
Stock-based compensation					1,293					1,293
Dividends and distributions declared for the period						(39,906)		(215)		(40,121)
Other comprehensive income (loss) - change in fair value and settlement of interest rate swaps							25,506	140		25,646
Net income						30,112		166		30,278
Balance at Mar. 31, 2021			$ 6		2,909,914	(101,137)	(10,760)	1,853		2,799,876
Balance (in shares) at Mar. 31, 2021			64,145,778
Balance at Dec. 31, 2020			$ 6		2,652,090	(91,343)	(36,266)	1,762		2,526,249
Balance (in shares) at Dec. 31, 2020			60,021,483
Series A preferred dividends declared for the period										(289)
Net income										89,570
Balance at Sep. 30, 2021		$ 175,000	$ 6		3,300,227	(130,455)	(4,893)	1,715		3,341,601
Balance (in shares) at Sep. 30, 2021		7,000	65,015,153
Balance at Mar. 31, 2021			$ 6		2,909,914	(101,137)	(10,760)	1,853		2,799,876
Balance (in shares) at Mar. 31, 2021			64,145,778
Issuance of common stock, net of issuance costs					336,875					336,876
Issuance of Series A preferred stock, net of issuance costs					336,875					336,876
Issuance of stock under the Omnibus Incentive Plan					22					22
Stock-based compensation					1,453					1,453
Dividends and distributions declared for the period						(42,829)		(225)		(43,054)
Other comprehensive income (loss) - change in fair value and settlement of interest rate swaps							2,503	14		2,517
Net income						22,347		114		22,461
Balance at Jun. 30, 2021			$ 6		3,248,264	(121,619)	(8,257)	1,756		3,120,151
Balance (in shares) at Jun. 30, 2021			64,145,778
Issuance of common stock, net of issuance costs	$ 175,000			$ (4,715)	55,878				$ 170,285	55,878
Issuance of common stock, net of issuance costs (in shares)	7,000		885,912
Issuance of Series A preferred stock, net of issuance costs	$ 175,000			$ (4,715)	55,878				$ 170,285	55,878
Issuance of Series A preferred stock, net of issuance costs (in shares)	7,000		885,912
Repurchase of common shares					(27)					(27)
Repurchase of common shares (in shares)			(369)
Issuance of stock under the Omnibus Incentive Plan (in shares)			5,891
Forfeiture of restricted stock					(468)					(468)
Forfeiture of restricted stock (in shares)			(22,059)
Stock-based compensation					1,295					1,295
Series A preferred dividends declared for the period		$ (289)								(289)
Common dividends and distributions declared for the period						(45,210)		(226)		(45,436)
Other comprehensive income (loss) - change in fair value and settlement of interest rate swaps							3,364	18		3,382
Net income		289				36,374		167		36,830
Balance at Sep. 30, 2021		$ 175,000	$ 6		$ 3,300,227	$ (130,455)	$ (4,893)	$ 1,715		$ 3,341,601
Balance (in shares) at Sep. 30, 2021		7,000	65,015,153