Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Shares	Additional Paid - In Capital	Retained earnings (distributions in excess of retained earnings)	Total Shareholders’ Equity	Noncontrolling Interest in Operating Partnership
Beginning Balance (in shares) at Dec. 31, 2014		34,173,691
Beginning Balance at Dec. 31, 2014	$ 591,952	$ 339	$ 599,318	$ (11,120)	$ 588,537	$ 3,415
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares pursuant to Equity Incentive Plan (in shares)		14,113
Issuance of shares pursuant to Equity Incentive Plan	412		412		412
Issuance of shares, net of offering costs of $1 in 2016 and $1,933 in 2015 (in shares)		4,026,193
Issuance of shares, net of offering costs of $1 in 2016 and $1,933 in 2015	118,849	$ 40	118,809		118,849
Issuance of restricted time-based shares		40,161
Issuance of performance based shares		44,274
Repurchase of common shares (in shares)		(763)
Repurchase of common shares	(22)		(22)		(22)
Amortization of share based compensation	566		370		370	196
Dividends declared on common shares ($0.31 per share) in 2016 and ($0.30 per share) in 2015	(11,512)			(11,512)	(11,512)
Distributions declared on LTIP units ($0.31 per unit) in 2016 and ($0.30 per unit) in 2015	(77)					(77)
Reallocation of noncontrolling interest	0		(191)		(191)	191
Net income	1,419			1,411	1,411	8
Ending Balance (in shares) at Mar. 31, 2015		38,297,669
Ending Balance at Mar. 31, 2015	701,587	$ 379	718,696	(21,221)	697,854	3,733
Beginning Balance (in shares) at Dec. 31, 2015		38,308,937
Beginning Balance at Dec. 31, 2015	697,002	$ 379	719,773	(27,281)	692,871	4,131
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares pursuant to Equity Incentive Plan (in shares)		34,339
Issuance of shares pursuant to Equity Incentive Plan	550		550		550
Issuance of shares, net of offering costs of $1 in 2016 and $1,933 in 2015 (in shares)		4,439
Issuance of shares, net of offering costs of $1 in 2016 and $1,933 in 2015	89	$ 1	88		89
Amortization of share based compensation	610		331		331	279
Dividends declared on common shares ($0.31 per share) in 2016 and ($0.30 per share) in 2015	(11,908)			(11,908)	(11,908)
Distributions declared on LTIP units ($0.31 per unit) in 2016 and ($0.30 per unit) in 2015	(171)					(171)
Reallocation of noncontrolling interest	0		11		11	(11)
Net income	3,322			3,300	3,300	22
Ending Balance (in shares) at Mar. 31, 2016		38,347,715
Ending Balance at Mar. 31, 2016	$ 689,494	$ 380	$ 720,753	$ (35,889)	$ 685,244	$ 4,250