Condensed Consolidated Statement of Equity - USD ($) $ in Thousands	Total	Common Stock	Additional paid-in capital	Distributions in excess of earnings	Accumulated other comprehensive loss	Total stockholders' equity	Noncontrolling interests
Beginning balance (in shares) at Dec. 31, 2017		44,937,763
Beginning balance at Dec. 31, 2017	$ 420,283	$ 449	$ 287,407	$ (61,166)	$ 0	$ 226,690	$ 193,593
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,983			5,040		5,040	1,943
Unrealized cash flow hedge losses	0
Realized cash flow hedge losses reclassified to net income	0
Restricted stock awards, net of tax withholding (in shares)		105,362
Restricted stock awards, net of tax withholding	500	$ 1	499			500
Restricted stock award forfeitures (in shares)		(550)
Restricted stock award forfeitures	(4)		(4)			(4)
Issuance of operating partnership units for acquisitions	1,696						1,696
Redemption of operating partnership units (in shares)		163,000
Redemption of operating partnership units	(5)	$ 2	1,797			1,799	(1,804)
Dividends and distributions declared	(12,552)			(9,064)		(9,064)	(3,488)
Ending balance, shares (in shares) at Mar. 31, 2018		45,205,575
Ending balance at Mar. 31, 2018	$ 416,901	$ 452	289,699	(65,190)	0	224,961	191,940
Beginning balance (in shares) at Dec. 31, 2018	50,013,731	50,013,731
Beginning balance at Dec. 31, 2018	$ 455,890	$ 500	357,353	(82,699)	(1,283)	273,871	182,019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,514			4,884		4,884	1,630
Unrealized cash flow hedge losses	(1,003)				(752)	(752)	(251)
Realized cash flow hedge losses reclassified to net income	72				54	54	18
Net proceeds from sales of common stock (in shares)		2,071,000
Net proceeds from sales of common stock	30,206	$ 21	30,185			30,206
Restricted stock awards, net of tax withholding (in shares)		124,013
Restricted stock awards, net of tax withholding	755	$ 1	754			755
Restricted stock award forfeitures (in shares)		(412)
Restricted stock award forfeitures	(4)		(4)			(4)
Redemption of operating partnership units (in shares)		118,471
Redemption of operating partnership units	0	$ 1	1,259			1,260	(1,260)
Dividends and distributions declared	$ (14,577)			(11,009)		(11,009)	(3,568)
Ending balance, shares (in shares) at Mar. 31, 2019	52,326,803	52,326,803
Ending balance at Mar. 31, 2019	$ 477,686	$ 523	$ 389,547	$ (88,949)	$ (1,981)	$ 299,140	$ 178,546