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Shares Outstanding and Earnings Per Share:
6 Months Ended
Jun. 30, 2011
Shares Outstanding and Earnings Per Share: [Abstract]  
Shares Outstanding and Earnings Per Share:
(6)    Shares Outstanding and Earnings Per Share:
Earnings per share have been calculated based on the weighted average number of shares outstanding as set forth below:
                                 
    Three Months     Six Months  
    Ended June 30,     Ended June 30,  
(in thousands, except per share data)   2011     2010     2011     2010  
Weighted average basic shares outstanding
    10,935       10,905       10,935       10,905  
Assumed exercise of stock options and issuance of stock awards
    12       17       12       15  
 
                       
Weighted average diluted shares outstanding
    10,947       10,922       10,947       10,920  
 
                       
 
                               
Net income
  $ 7,946     $ 3,254     $ 18,269     $ 4,965  
 
                               
Basic earnings per share
  $ 0.73     $ 0.30     $ 1.67     $ 0.46  
 
                       
Diluted earnings per share
  $ 0.73     $ 0.30     $ 1.67     $ 0.45  
 
                       
 
                               
Anti-dilutive securities outstanding
    118       143       118       143