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 (deficit)	Noncontrolling interests
Beginning balance (in shares) at Dec. 31, 2013		19,163,413
Beginning balance at Dec. 31, 2013	$ 105,521	$ 192	$ 1,247	$ (47,934)	$ 0	$ (46,495)	$ 152,016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,759			7,691		7,691	5,068
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)		5,750,000
Net proceeds from sale of common stock	49,299	$ 57	49,242			49,299
Restricted stock award grants (in shares)		109,288
Restricted stock awards	1,285	$ 1	1,284			1,285
Acquisitions of real estate investments	16,351						16,351
Exchange of owners’ equity for common units	0		(301)			(301)	301
Dividends and distributions declared	(23,309)			(14,170)		(14,170)	(9,139)
Ending balance (in shares) at Dec. 31, 2014		25,022,701
Ending balance at Dec. 31, 2014	161,906	$ 250	51,472	(54,413)	0	(2,691)	164,597
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	31,183			19,642		19,642	11,541
Unrealized cash flow hedge losses	(1,075)				(665)	(665)	(410)
Realized cash flow hedge losses reclassified to net income	27				17	17	10
Net proceeds from sale of common stock (in shares)		4,560,049
Net proceeds from sale of common stock	46,035	$ 45	45,990			46,035
Restricted stock award grants (in shares)		78,109
Restricted stock awards	993	$ 1	992			993
Acquisitions of real estate investments (in shares)		415,500
Acquisitions of real estate investments	15,169	$ 4	4,429			4,433	10,736
Exchange of owners’ equity for common units	(241)		23			23	(264)
Dividends and distributions declared	$ (28,277)			(18,239)		(18,239)	(10,038)
Ending balance (in shares) at Dec. 31, 2015	30,076,359	30,076,359
Ending 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
Unrealized cash flow hedge losses	0
Realized cash flow hedge losses reclassified to net income	0
Dedesignation of cash flow hedge	1,048				648	648	400
Net proceeds from sale of common stock (in shares)		5,312,855
Net proceeds from sale of common stock	67,022	$ 53	66,969			67,022
Restricted stock award grants (in shares)		101,147
Restricted stock awards	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	37,490,361
Ending balance at Dec. 31, 2016	$ 348,978	$ 374	$ 197,114	$ (49,345)	$ 0	$ 148,143	$ 200,835