Consolidated Statements 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, 2015		30,076,359
Beginning balance at Dec. 31, 2015	$ 225,720	$ 300	$ 102,906	$ (53,010)	$ (648)	$ 49,548	$ 176,172
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	42,755			28,074		28,074	14,681
Dedesignation of cash flow hedge	1,048				648	648	400
Unrealized cash flow hedge losses	0
Realized cash flow hedge losses reclassified to net income	0
Net proceeds from sale of common stock (in shares)		5,312,855
Net proceeds from sales of common stock	67,022	$ 53	66,969			67,022
Restricted stock awards, net of tax withholding (in shares)		101,147
Restricted stock awards, net of tax withholding	1,162	$ 1	1,161			1,162
Acquisitions of real estate investments (in shares)		2,000,000
Acquisitions of real estate investments	47,278	$ 20	26,080			26,100	21,178
Redemption of operating partnership units	(58)		(2)			(2)	(56)
Dividends and distributions declared	(35,949)			(24,409)		(24,409)	(11,540)
Ending balance (in shares) at Dec. 31, 2016		37,490,361
Ending balance at Dec. 31, 2016	348,978	$ 374	197,114	(49,345)	0	148,143	200,835
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	29,925			21,047		21,047	8,878
Unrealized cash flow hedge losses	0
Realized cash flow hedge losses reclassified to net income	0
Net proceeds from sale of common stock (in shares)		7,350,690
Net proceeds from sales of common stock	91,381	$ 74	91,307			91,381
Restricted stock awards, net of tax withholding (in shares)		97,173
Restricted stock awards, net of tax withholding	1,443	$ 1	1,442			1,443
Restricted stock award forfeitures (in shares)		(461)
Restricted stock award forfeitures	(2)		(2)			(2)
Acquisitions of real estate investments	(511)		(1,493)			(1,493)	982
Redemption of operating partnership units	(5,155)		(961)			(961)	(4,194)
Dividends and distributions declared	$ (45,776)			(32,868)		(32,868)	(12,908)
Ending balance (in shares) at Dec. 31, 2017	44,937,763	44,937,763
Ending 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	23,492			17,203		17,203	6,289
Unrealized cash flow hedge losses	(1,894)				(1,410)	(1,410)	(484)
Realized cash flow hedge losses reclassified to net income	169				127	127	42
Net proceeds from sale of common stock (in shares)		4,617,409
Net proceeds from sales of common stock	65,244	$ 46	65,198			65,244
Restricted stock awards, net of tax withholding (in shares)		124,258
Restricted stock awards, net of tax withholding	1,564	$ 2	1,562			1,564
Restricted stock award forfeitures (in shares)		(4,403)
Restricted stock award forfeitures	(32)		(32)			(32)
Issuance of operating partnership units for acquisitions	2,196		(5)			(5)	2,201
Redemption of operating partnership units (in shares)		338,704
Redemption of operating partnership units	(2,595)	$ 3	3,223			3,226	(5,821)
Dividends and distributions declared	$ (52,537)			(38,736)		(38,736)	(13,801)
Ending balance (in shares) at Dec. 31, 2018	50,013,731	50,013,731
Ending balance at Dec. 31, 2018	$ 455,890	$ 500	$ 357,353	$ (82,699)	$ (1,283)	$ 273,871	$ 182,019