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Earnings Per Share
 6 Months Ended
Jun. 30, 2011
Earnings Per Share [Abstract]  
Earnings Per Share
(4) Earnings Per Share
     The Company computes earnings per share in accordance with FASB ASC 260-10. Under the guidance, unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents are participating securities and, therefore, are included in computing basic earnings per share (EPS) pursuant to the two-class method. The two-class method determines earnings per share for each class of common stock and participating securities according to dividends or dividend equivalents and their respective participation rights in undistributed earnings.
Basic earnings per share (“Basic EPS”) has been computed using the weighted average number of common shares outstanding during each period. Diluted EPS for the three and six month periods ended June 30, 2011 and 2010 assumes, as of the beginning of the period, exercise of stock options using the treasury stock method. Certain of our stock options that would potentially dilute Basic EPS in the future were also antidilutive for the three and six month periods ended June 30, 2011 and 2010, and are discussed below.
     The following is a reconciliation of the numerators and denominators used in the calculation of Basic and Diluted EPS for the three and six month periods ended June 30, 2011 and 2010 (in thousands, except per share amounts):
                                                 
    Three Months Ended June 30, 2011     Three Months Ended June 30, 2010  
    Income                     Income                
    from                     from                
    Continuing             Per Share     Continuing             Per Share  
    Operations     Shares     Amount     Operations     Shares     Amount  
 
                                               
Basic EPS:
                                               
Income from continuing operations, and Share Amounts
  $ 26,682       42,436             $ 12,513       37,845          
Less: Income from continuing operations allocated to unvested shareholders
    (456 )     —               (242 )     —          
 
                                       
Income from continuing operations allocated to common shares
  $ 26,226       42,436     $ 0.62     $ 12,271       37,845     $ 0.32  
Dilutive Securities:
                                               
Plus: Income from continuing operations allocated to unvested shareholders
    456       —               242       —          
Less: Income from continuing operations re-allocated to unvested shareholders
    (454 )     —               (241 )     —          
Stock Options
    —       229               —       258          
 
                                       
Diluted EPS:
                                               
Income from continuing operations allocated to common shares, and assumed share conversions
  $ 26,228       42,665     $ 0.61     $ 12,272       38,103     $ 0.32  
 
                                       
                                                 
    Six Months Ended June 30, 2011     Six Months Ended June 30, 2010  
    Income                     Income                
    from                     from                
    Continuing             Per Share     Continuing             Per Share  
    Operations     Shares     Amount     Operations     Shares     Amount  
 
                                               
Basic EPS:
                                               
Income from continuing operations, and Share Amounts
  $ 46,931       42,313             $ 26,753       37,749          
Less: Income from continuing operations allocated to unvested shareholders
    (807 )     —               (512 )     —          
 
                                       
Income from continuing operations allocated to common shares
  $ 46,124       42,313     $ 1.09     $ 26,241       37,749     $ 0.70  
Dilutive Securities:
                                               
Plus: Income from continuing operations allocated to unvested shareholders
    807       —               512       —          
Less: Income from continuing operations re-allocated to unvested shareholders
    (803 )     —               (509 )     —          
Stock Options
    —       219               —       230          
 
                                       
Diluted EPS:
                                               
Income from continuing operations allocated to common shares, and assumed share conversions
  $ 46,128       42,532     $ 1.08     $ 26,244       37,979     $ 0.69  
 
                                       
     Options to purchase approximately 1.4 million shares at an average exercise price of $32.39 were outstanding at June 30, 2011, while options to purchase approximately 1.5 million shares at an average exercise price of $29.18 were outstanding at June 30, 2010. Approximately 0.6 million and 1.2 million stock options to purchase shares were not included in the computation of Diluted EPS for the three months ended June 30, 2011 and 2010, respectively, and 0.8 million and 1.2 million stock options to purchase shares were not included in the computation of Diluted EPS for the six months ended June 30, 2011, because these stock options were antidilutive, in that the sum of the stock option price, unrecognized compensation expense and excess tax benefits recognized as proceeds in the treasury stock method was greater than the average closing market price for the common shares during those periods.