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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Earnings Per Share    
Net income attributable to common shares $ 1,849 $ 600
Weighted average common shares outstanding - basic 20,673,896 20,455,875
Effect of potentially dilutive common shares:    
Stock options 363,346 119,963
Unvested restricted awards 277,537 119,017
Weighted average common shares outstanding - diluted 21,314,779 20,694,855
Net income per share attributable to common shares    
Basic (in dollars per share) $ 0.09 $ 0.03
Diluted (in dollars per share) $ 0.09 $ 0.03
Earnings Per Share    
Weighted average potentially dilutive securities excluded in calculation of basic and diluted income (loss) per share 133,166 23,806