Earnings 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
Earnings Per Share
Net income attributable to common shares	$ 2,618	$ 826	$ 4,467	$ 1,426
Weighted average common shares outstanding - basic	20,829,375	20,532,930	20,752,065	20,494,402
Effect of potentially dilutive common shares:
Stock options	406,482	216,736	386,988	176,905
Unvested restricted awards	210,018	165,020	273,236	129,743
Weighted average common shares outstanding - diluted	21,445,875	20,914,686	21,412,289	20,801,050
Net income per share attributable to common shares
Basic (in dollars per share)	$ 0.13	$ 0.04	$ 0.22	$ 0.07
Diluted (in dollars per share)	$ 0.12	$ 0.04	$ 0.21	$ 0.07
Earnings Per Share
Weighted average potentially dilutive securities excluded in calculation of basic and diluted income (loss) per share	210,811	199,710	142,181	228,013