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Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2012
Significant Accounting Policies [Abstract]  
Schedule of reconciliation of shares used to calculate basic and diluted earnings per share
 
For the three months
ended September 30,
   
For the nine months
ended September 30,
 
   
2011
   
2012
   
2011
   
2012
 
Weighted average shares outstanding used to compute basic earnings per share
    11,623       11,433       12,016       11,428  
Incremental shares issuable upon the assumed exercise of stock options
                11        
Unvested restricted stock
    24       54       28       54  
Shares used to compute diluted earnings per share
    11,647       11,487       12,055       11,482