CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Series A Preferred Stock [Member] Total Stockholders' Equity [Member]	Series A Preferred Stock [Member] Retained Earnings (Accumulated Deficit) [Member]	Series A Preferred Stock [Member]	Series B Preferred Stock [Member] Total Stockholders' Equity [Member]	Series B Preferred Stock [Member] Retained Earnings (Accumulated Deficit) [Member]	Series B Preferred Stock [Member]	Total Stockholders' Equity [Member] Internalization Expenses [Member]	Total Stockholders' Equity [Member]	Common Stock [Member]	Additional Paid-in Capital [Member] Internalization Expenses [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Non-Controlling Interests [Member] Property Acquisition [Member]	Non-Controlling Interests [Member] Internalization Expenses [Member]	Non-Controlling Interests [Member]	Property Acquisition [Member]	Internalization Expenses [Member]	Total
Balance at Dec. 31, 2018			$ 122,137			$ 37,401		$ 547,864	$ 204		$ 386,394	$ 1,728							$ 547,864
Balance (in shares) at Dec. 31, 2018			125,000			1,571,734			20,430,218
Equity offering costs related to preferred stock costs						$ (103)		(103)											(103)
At-the-market issuance of common stock, net of offering costs								2,752	$ 1		2,751								2,752
At-the-market issuance of common stock, net of offering costs (in shares)									136,192
Stock dividend paid on preferred stock			$ 2,125					2,125											2,125
Stock dividend paid on preferred stock (in shares)			2,125
Repurchase and retirement of shares of common stock								(73)			(73)								(73)
Repurchase and retirement of shares of common stock (in shares)									(3,408)
Issuances of stock-based awards (in shares)									4,692
Stock-based compensation								359			359								359
Dividends declared on preferred stock	$ (4,344)	$ (4,344)	$ (4,344)	$ (688)	$ (688)	(688)
Dividends declared on common stock								(7,205)				(7,205)							(7,205)
Net income (loss)								12,114				12,114							12,114
Balance at Mar. 31, 2019			$ 124,262			$ 37,298		552,801	$ 205		389,431	1,605							552,801
Balance (in shares) at Mar. 31, 2019			127,125			1,571,734			20,567,694
Balance at Dec. 31, 2018			$ 122,137			$ 37,401		547,864	$ 204		386,394	1,728							547,864
Balance (in shares) at Dec. 31, 2018			125,000			1,571,734			20,430,218
Issuance of Operating Company ("OC") Units															$ 0
Stock dividend paid on preferred stock																			6,375
Other comprehensive income (loss) - derivative instruments																			(500)
Net income (loss)																			37,941
Balance at Sep. 30, 2019			$ 128,512			$ 37,298		589,417	$ 222		422,240	1,645	$ (500)						589,417
Balance (in shares) at Sep. 30, 2019			131,375			1,571,734			22,236,871
Balance at Mar. 31, 2019			$ 124,262			$ 37,298		552,801	$ 205		389,431	1,605							552,801
Balance (in shares) at Mar. 31, 2019			127,125			1,571,734			20,567,694
At-the-market issuance of common stock, net of offering costs								29,991	$ 15		29,976								29,991
At-the-market issuance of common stock, net of offering costs (in shares)									1,452,076
Stock dividend paid on preferred stock			$ 2,125					2,125											2,125
Stock dividend paid on preferred stock (in shares)			2,125
Repurchase and retirement of shares of common stock								(396)			(396)								(396)
Repurchase and retirement of shares of common stock (in shares)									(18,544)
Issuances of stock-based awards									$ 1		(1)
Issuances of stock-based awards (in shares)									133,730
Stock-based compensation								750			750								750
Forfeiture and retirement of shares related to stock-based awards (in shares)									(1,666)
Dividends declared on preferred stock	(4,407)	(4,407)	$ (4,407)	(688)	(688)	$ (688)
Dividends declared on common stock								(7,754)				(7,754)							(7,754)
Other comprehensive income (loss) - derivative instruments								(441)					(441)						(441)
Net income (loss)								14,874				14,874							14,874
Balance at Jun. 30, 2019			$ 126,387			$ 37,298		586,855	$ 221		419,760	3,630	(441)						586,855
Balance (in shares) at Jun. 30, 2019			129,250			1,571,734			22,133,290
At-the-market issuance of common stock, net of offering costs								1,901	$ 1		1,900								1,901
At-the-market issuance of common stock, net of offering costs (in shares)									96,081
Stock dividend paid on preferred stock			$ 2,125					2,125											2,125
Stock dividend paid on preferred stock (in shares)			2,125
Issuances of stock-based awards (in shares)									7,500
Stock-based compensation								580			580								580
Dividends declared on preferred stock	(4,469)	(4,469)	$ (4,469)	(688)	(688)	$ (688)
Dividends declared on common stock								(7,782)				(7,782)							(7,782)
Other comprehensive income (loss) - derivative instruments								(59)					(59)						(59)
Net income (loss)								10,954				10,954							10,954
Balance at Sep. 30, 2019			$ 128,512			$ 37,298		589,417	$ 222		422,240	1,645	(500)						589,417
Balance (in shares) at Sep. 30, 2019			131,375			1,571,734			22,236,871
Balance at Dec. 31, 2019			$ 130,637			$ 37,298		588,874	$ 224		426,129	(5,021)	(393)						588,874
Balance (in shares) at Dec. 31, 2019			133,500			1,571,734			22,423,283
At-the-market issuance of common stock, net of offering costs								15,072	$ 8		15,064								15,072
At-the-market issuance of common stock, net of offering costs (in shares)									810,000
Issuance of Operating Company ("OC") Units							$ 8,554			$ 8,554				$ 1,536	33,538		$ 1,536	$ 42,092
Stock dividend paid on preferred stock			$ 2,125					2,125											2,125
Stock dividend paid on preferred stock (in shares)			2,125
Repurchase and retirement of shares of common stock								(36)			(36)								(36)
Repurchase and retirement of shares of common stock (in shares)									(1,926)
Issuances of stock-based awards (in shares)									40,502
Stock-based compensation								607			607								607
Dividends declared on preferred stock	(4,519)	(4,519)	$ (4,519)	(688)	(688)	$ (688)
Dividends declared on common stock								(5,354)				(5,354)							(5,354)
Distributions declared to Non-controlling interests																$ (192)			(192)
Other comprehensive income (loss) - derivative instruments								(609)					(609)			(22)			(631)
Net income (loss)								(52,835)				(52,835)				(1,947)			(54,782)
Balance at Mar. 31, 2020			$ 132,762			$ 37,298		551,191	$ 232		450,318	(68,417)	(1,002)			32,913			584,104
Balance (in shares) at Mar. 31, 2020			135,625			1,571,734			23,271,859
Balance at Dec. 31, 2019			$ 130,637			$ 37,298		588,874	$ 224		426,129	(5,021)	(393)						588,874
Balance (in shares) at Dec. 31, 2019			133,500			1,571,734			22,423,283
Issuance of Operating Company ("OC") Units															$ 33,538
Stock dividend paid on preferred stock																			6,375
Other comprehensive income (loss) - derivative instruments																			(715)
Net income (loss)																			(61,407)
Balance at Sep. 30, 2020			$ 137,012			$ 37,298		535,351	$ 232		451,182	(89,289)	(1,084)			37,263			572,614
Balance (in shares) at Sep. 30, 2020			139,875			1,571,734			23,263,130
Balance at Mar. 31, 2020			$ 132,762			$ 37,298		551,191	$ 232		450,318	(68,417)	(1,002)			32,913			584,104
Balance (in shares) at Mar. 31, 2020			135,625			1,571,734			23,271,859
Issuance of Operating Company ("OC") Units														5,157			5,157
Stock dividend paid on preferred stock			$ 2,125					2,125											2,125
Stock dividend paid on preferred stock (in shares)			2,125
Equity offering costs related to issuance of common stock								(24)			(24)								(24)
Repurchase and retirement of shares of common stock								(363)			(363)								(363)
Repurchase and retirement of shares of common stock (in shares)									(27,629)
Issuances of stock-based awards (in shares)									18,900
Stock-based compensation								814			814								814
Dividends declared on preferred stock	(4,557)	(4,557)	$ (4,557)	(688)	(688)	$ (688)
Dividends declared on common stock								(5,351)				(5,351)							(5,351)
Distributions declared to Non-controlling interests																(433)			(433)
Other comprehensive income (loss) - derivative instruments								(266)					(266)			(21)			(287)
Net income (loss)								(341)				(341)				(652)			(993)
Balance at Jun. 30, 2020			$ 134,887			$ 37,298		542,540	$ 232		450,745	(79,354)	(1,268)			36,964			579,504
Balance (in shares) at Jun. 30, 2020			137,750			1,571,734			23,263,130
Issuance of Operating Company ("OC") Units														$ 1,285			$ 1,285
Stock dividend paid on preferred stock			$ 2,125					2,125											2,125
Stock dividend paid on preferred stock (in shares)			2,125
Stock-based compensation								437			437								437
Dividends declared on preferred stock	$ (4,621)	$ (4,621)	$ (4,621)	$ (688)	$ (688)	$ (688)
Other comprehensive income (loss) - derivative instruments								184					184			19			203
Net income (loss)								(4,626)				(4,626)				(1,005)			(5,631)
Balance at Sep. 30, 2020			$ 137,012			$ 37,298		$ 535,351	$ 232		$ 451,182	$ (89,289)	$ (1,084)			$ 37,263			$ 572,614
Balance (in shares) at Sep. 30, 2020			139,875			1,571,734			23,263,130