Condensed Consolidated Statement of Equity - 9 months ended Sep. 30, 2018 - 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	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	18,597			13,561		13,561	5,036
Unrealized cash flow hedge losses	(130)				(97)	(97)	(33)
Realized cash flow hedge losses reclassified to net income	67				50	50	17
Net proceeds from sales of common stock (in shares)		4,227,978
Net proceeds from sales of common stock	59,529	$ 42	59,487			59,529
Restricted stock awards, net of tax withholding (in shares)		127,275
Restricted stock awards, net of tax withholding	1,311	$ 2	1,309			1,311
Restricted stock award forfeitures (in shares)		(3,298)
Restricted stock award forfeitures	(26)		(26)			(26)
Issuance of operating partnership units for acquisitions	2,196		(5)			(5)	2,201
Redemption of operating partnership units (in shares)		286,504
Redemption of operating partnership units	(2,531)	$ 3	2,677			2,680	(5,211)
Dividends and distributions declared	$ (39,160)			(28,781)		(28,781)	(10,379)
Ending balance, shares (in shares) at Sep. 30, 2018	49,576,222	49,576,222
Ending balance at Sep. 30, 2018	$ 460,136	$ 496	$ 350,849	$ (76,386)	$ (47)	$ 274,912	$ 185,224