Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended									12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share
Net income (loss) attributable to common shares	$ 1,862	$ 1,320	$ 826	$ 600	$ 179	$ 112	$ (1,530)	$ (3,372)	$ (3,351)	$ 4,608	$ (4,611)
Weighted average common shares outstanding - basic									19,458,605	20,537,946	19,609,375
Effect of potentially dilutive common shares:
Stock options										211,222
Unvested restricted awards										243,122
Weighted average common shares outstanding - diluted									19,458,605	20,992,290	19,609,375
Net income (loss) per share attributable to common shares
Basic (in dollars per share)	$ 0.09	$ 0.06	$ 0.04	$ 0.03	$ 0.01	$ 0.01	$ (0.08)	$ (0.17)	$ (0.17)	$ 0.22	$ (0.24)
Diluted (in dollars per share)	$ 0.09	$ 0.06	$ 0.04	$ 0.03	$ 0.01	$ 0.01	$ (0.08)	$ (0.17)	$ (0.17)	$ 0.22	$ (0.24)
Earnings Per Share
Potentially dilutive securities excluded in calculation of basic and diluted income (loss) per share									782,992	153,972	1,341,282