Earnings Per Share - Reconciliation of Amounts Used in Calculating Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator:
Net income attributable to common shareholders	$ 3,300	$ 1,411
Dividends paid on unvested shares and units	(46)	(43)
Net income attributable to common shareholders	$ 3,254	$ 1,368
Denominator:
Weighted average number of common shares - basic (in shares)	38,274,448	37,018,039
Effect of dilutive securities:
Unvested shares (in shares)	396,681	304,239
Weighted average number of common shares - diluted (in shares)	38,671,129	37,322,278
Basic income per Common Share:
Net income attributable to common shareholders per weighted average basic common share (in dollars per share)	$ 0.09	$ 0.04
Diluted income per Common Share:
Net income attributable to common shareholders per weighted average diluted common share (in dollars per share)	$ 0.08	$ 0.04