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 $2,001 in 2015 (in shares)		4,026,318
Issuance of shares, net of offering costs of $1 in 2016 and $2,001 in 2015	118,788	$ 40	118,748		118,788
Issuance of restricted time-based shares		49,110
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	1,080		769		769	311
Dividends declared on common shares ($0.64 per share) in 2016 and ($0.60 per share) in 2015	(23,025)			(23,025)	(23,025)
Distributions declared on LTIP units ($0.64 per unit) in 2016 and ($0.60 per unit) in 2015	(173)					(173)
Reallocation of noncontrolling interest	0		(320)		(320)	320
Net income	14,265			14,175	14,175	90
Ending Balance (in shares) at Jun. 30, 2015		38,306,743
Ending Balance at Jun. 30, 2015	703,277	$ 379	718,905	(19,970)	699,314	3,963
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 $2,001 in 2015 (in shares)		9,278
Issuance of shares, net of offering costs of $1 in 2016 and $2,001 in 2015	192	$ 1	191		192
Amortization of share based compensation	1,244		646		646	598
Dividends declared on common shares ($0.64 per share) in 2016 and ($0.60 per share) in 2015	(24,586)			(24,586)	(24,586)
Distributions declared on LTIP units ($0.64 per unit) in 2016 and ($0.60 per unit) in 2015	(354)					(354)
Reallocation of noncontrolling interest	0		11		11	(11)
Net income	15,572			15,468	15,468	104
Ending Balance (in shares) at Jun. 30, 2016		38,352,554
Ending Balance at Jun. 30, 2016	$ 689,620	$ 380	$ 721,171	$ (36,399)	$ 685,152	$ 4,468