Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Shares	Additional Paid - In Capital	Accumulated Deficit	Total Shareholders’ Equity	Noncontrolling Interest in Operating Partnership
Beginning Balance (in shares) at Dec. 31, 2012		13,908,907
Beginning Balance at Dec. 31, 2012	$ 206,612	$ 137	$ 240,355	$ (35,491)	$ 205,001	$ 1,611
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares pursuant to Equity Incentive Plan (in shares)		22,536
Issuance of shares pursuant to Equity Incentive Plan	337		337		337
Issuance of shares, net of offering costs of $2,042 in 2015, $7,153 in 2014, and $10,388 in 2013 (in shares)		12,306,000
Issuance of shares, net of offering costs of $2,042 in 2015, $7,153 in 2014, and $10,388 in 2013	192,363	$ 124	192,239		192,363
Issuance of restricted time-based shares		40,829
Issuance of performance based shares		17,731
Repurchase of common shares (in shares)		(445)
Repurchase of common shares	(7)		(7)		(7)
Amortization of share based compensation	1,748		966		966	782
Dividends declared on common shares ($1.28 per share) in 2015, ($0.93 per share) in 2014, and ($0.84 per share) in 2013	(18,283)			(18,283)	(18,283)
Distributions declared on LTIP units ($1.28 per share) in 2015, ($0.93 per share) in 2014, and ($0.84 per share) in 2013	(216)					(216)
Reallocation of noncontrolling interest	0		10		10	(10)
Net income	2,982			2,982	2,982
Ending Balance (in shares) at Dec. 31, 2013		26,295,558
Ending Balance at Dec. 31, 2013	385,536	$ 261	433,900	(50,792)	383,369	2,167
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares pursuant to Equity Incentive Plan (in shares)		16,542
Issuance of shares pursuant to Equity Incentive Plan	337		337		337
Issuance of shares, net of offering costs of $2,042 in 2015, $7,153 in 2014, and $10,388 in 2013 (in shares)		7,782,903
Issuance of shares, net of offering costs of $2,042 in 2015, $7,153 in 2014, and $10,388 in 2013	164,399	$ 78	164,321		164,399
Issuance of restricted time-based shares		48,213
Issuance of performance based shares		31,342
Repurchase of common shares (in shares)		(867)
Repurchase of common shares	(18)		(18)		(18)
Amortization of share based compensation	2,058		1,275		1,275	783
Dividends declared on common shares ($1.28 per share) in 2015, ($0.93 per share) in 2014, and ($0.84 per share) in 2013	(27,201)			(27,201)	(27,201)
Distributions declared on LTIP units ($1.28 per share) in 2015, ($0.93 per share) in 2014, and ($0.84 per share) in 2013	(240)					(240)
Reallocation of noncontrolling interest	0		(497)		(497)	497
Net income	67,081			66,873	66,873	208
Ending Balance (in shares) at Dec. 31, 2014		34,173,691
Ending 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 $2,042 in 2015, $7,153 in 2014, and $10,388 in 2013 (in shares)		4,028,512
Issuance of shares, net of offering costs of $2,042 in 2015, $7,153 in 2014, and $10,388 in 2013	118,797	$ 40	118,757		118,797
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	2,285		1,594		1,594	691
Dividends declared on common shares ($1.28 per share) in 2015, ($0.93 per share) in 2014, and ($0.84 per share) in 2013	(49,127)			(49,127)	(49,127)
Distributions declared on LTIP units ($1.28 per share) in 2015, ($0.93 per share) in 2014, and ($0.84 per share) in 2013	(473)					(473)
Reallocation of noncontrolling interest	0		(286)		(286)	286
Net income	33,178			32,966	32,966	212
Ending Balance (in shares) at Dec. 31, 2015		38,308,937
Ending Balance at Dec. 31, 2015	$ 697,002	$ 379	$ 719,773	$ (27,281)	$ 692,871	$ 4,131