Earnings Per Share - Reconciliation of Amounts Used in Calculating Basic and Diluted Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Numerator:
Net income (loss)	$ 2,176		$ 1,157		$ 557		$ (574)
Dividends paid on unvested shares and units	(73)		(70)		(151)		(134)
Net income (loss) attributable to common shareholders	$ 2,103		$ 1,087		$ 406		$ (708)
Denominator:
Weighted average number of common shares - basic (in shares)	18,147,108		13,810,190		17,682,199		13,802,588
Effect of dilutive securities:
Unvested shares (in shares)	236,518	[1]	105,123	[1]	215,056	[1]		[1]
Weighted average number of common shares - diluted (in shares)	18,383,626		13,915,313		17,897,255		13,802,588
Basic Loss per Common Share:
Net loss attributable to common shareholders per weighted average common share (in dollars per share)	$ 0.12		$ 0.08		$ 0.02		$ (0.05)
Diluted Loss per Common Share:
Net loss attributable to common shareholders per weighted average common share (in dollars per share)	$ 0.11		$ 0.08		$ 0.02		$ (0.05)

[1] Unvested restricted shares and unvested long-term incentive plan units that could potentially dilute basic earnings per share in the future were not included in the computation of diluted loss per share, for the periods where a loss has been recorded, because they would have been anti-dilutive for the periods presented.