Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share
Net income attributable to common shares	$ 2,901	$ 1,320	$ 7,368	$ 2,749
Weighted average common shares outstanding - basic	20,871,504	20,554,893	20,793,596	20,514,713
Effect of potentially dilutive common shares:
Stock options	391,398	267,831	388,889	225,520
Unvested restricted awards	217,069	204,911	283,225	150,661
Weighted average common shares outstanding - diluted	21,479,971	21,027,635	21,465,710	20,890,894
Net income per share attributable to common shares
Basic (in dollars per share)	$ 0.14	$ 0.06	$ 0.35	$ 0.13
Diluted (in dollars per share)	$ 0.14	$ 0.06	$ 0.34	$ 0.13
Earnings Per Share
Weighted average potentially dilutive securities excluded in calculation of basic and diluted income (loss) per share	211,721	200,908	166,732	100,587