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Significant Accounting Policies (Tables)
6 Months Ended
Jun. 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 June 30,
   
For the six months
ended June 30,
 
   
2011
   
2012
   
2011
   
2012
 
Weighted average shares outstanding used to compute basic earnings per share
    11,692       11,430       12,215       11,425  
Incremental shares issuable upon the assumed exercise of stock options
    15             16        
Unvested restricted stock
    30       53       32       55  
Shares used to compute diluted earnings per share
    11,737       11,483       12,263       11,480