CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid in Capital	Cumulative Net Income	Accumulated Other Comprehensive (Loss) Income	Cumulative Dividends
Beginning Balance (in shares) at Dec. 31, 2018		18,634,502
Beginning Balance at Dec. 31, 2018	$ 271,659	$ 186	$ 337,180	$ 9,178	$ 633	$ (75,518)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net of issuance costs (in shares)		1,321,362
Issuance of common stock, net of issuance costs	51,332	$ 14	51,318
Stock-based compensation (in shares)		221,829
Stock-based compensation	2,751	$ 2	2,749
Unrecognized loss on cash flow hedges	(7,305)				(7,305)
Reclassification adjustment for losses included in net income (interest expense)	(154)				(154)
Net income	6,163			6,163
Dividends to common stockholders	(23,499)					(23,499)
Ending Balance (in shares) at Sep. 30, 2019		20,177,693
Ending Balance at Sep. 30, 2019	300,947	$ 202	391,247	15,341	(6,826)	(99,017)
Beginning Balance (in shares) at Dec. 31, 2018		18,634,502
Beginning Balance at Dec. 31, 2018	$ 271,659	$ 186	337,180	9,178	633	(75,518)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net of issuance costs (in shares)	2,554,247
Ending Balance (in shares) at Dec. 31, 2019		21,410,578
Ending Balance at Dec. 31, 2019	$ 353,411	$ 214	447,916	17,554	(4,808)	(107,465)
Beginning Balance (in shares) at Jun. 30, 2019		19,401,244
Beginning Balance at Jun. 30, 2019	279,120	$ 194	361,913	12,694	(4,769)	(90,912)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net of issuance costs (in shares)		680,309
Issuance of common stock, net of issuance costs	28,340	$ 7	28,333
Stock-based compensation (in shares)		96,140
Stock-based compensation	1,002	$ 1	1,001
Unrecognized loss on cash flow hedges	(2,060)				(2,060)
Reclassification adjustment for losses included in net income (interest expense)	3				3
Net income	2,647			2,647
Dividends to common stockholders	(8,105)					(8,105)
Ending Balance (in shares) at Sep. 30, 2019		20,177,693
Ending Balance at Sep. 30, 2019	300,947	$ 202	391,247	15,341	(6,826)	(99,017)
Beginning Balance (in shares) at Dec. 31, 2019		21,410,578
Beginning Balance at Dec. 31, 2019	$ 353,411	$ 214	447,916	17,554	(4,808)	(107,465)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net of issuance costs (in shares)	1,726,384	1,726,384
Issuance of common stock, net of issuance costs	$ 75,382	$ 17	75,365
Stock-based compensation (in shares)		270,536
Stock-based compensation	3,358	$ 3	3,355
Unrecognized loss on cash flow hedges	(10,292)				(10,292)
Reclassification adjustment for losses included in net income (interest expense)	1,965				1,965
Net income	13,837			13,837
Dividends to common stockholders	(28,040)					(28,040)
Ending Balance (in shares) at Sep. 30, 2020		23,407,498
Ending Balance at Sep. 30, 2020	409,621	$ 234	526,636	31,391	(13,135)	(135,505)
Beginning Balance (in shares) at Jun. 30, 2020		22,726,141
Beginning Balance at Jun. 30, 2020	387,103	$ 227	500,477	26,180	(13,969)	(125,812)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net of issuance costs (in shares)		536,839
Issuance of common stock, net of issuance costs	24,890	$ 5	24,885
Stock-based compensation (in shares)		144,518
Stock-based compensation	1,276	$ 2	1,274
Unrecognized loss on cash flow hedges	(99)				(99)
Reclassification adjustment for losses included in net income (interest expense)	933				933
Net income	5,211			5,211
Dividends to common stockholders	(9,693)					(9,693)
Ending Balance (in shares) at Sep. 30, 2020		23,407,498
Ending Balance at Sep. 30, 2020	$ 409,621	$ 234	$ 526,636	$ 31,391	$ (13,135)	$ (135,505)