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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2011
Earnings Per Share [Abstract] 
Reconciliation of the numerators and denominators used in the calculation of Basic and Diluted EPS
                                                 
    Three Months Ended September 30, 2011     Three Months Ended September 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
  $ 17,007       42,470             $ 9,403       37,880          
Less: Income from continuing operations allocated to unvested shares
    (326 )     —               (179 )     —          
 
                                       
Income from continuing operations allocated to common shares
  $ 16,681       42,470     $ 0.39     $ 9,224       37,880     $ 0.24  
Dilutive Securities:
                                               
Plus: Income from continuing operations allocated to unvested shares
    326       —               179       —          
Less: Income from continuing operations re-allocated to unvested shares
    (324 )     —               (178 )     —          
Stock Options
    —       208               —       178          
 
                                       
Diluted EPS:
                                               
Income from continuing operations allocated to common shares, and assumed share conversions
  $ 16,683       42,678     $ 0.39     $ 9,225       38,058     $ 0.24  
 
                                       
                                                 
    Nine months Ended September 30, 2011     Nine months Ended September 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
  $ 63,938       42,365             $ 36,156       37,792          
Less: Income from continuing operations allocated to unvested shares
    (1,195 )     —               (693 )     —          
 
                                       
Income from continuing operations allocated to common shares
  $ 62,743       42,365     $ 1.48     $ 35,463       37,792     $ 0.94  
Dilutive Securities:
                                               
Plus: Income from continuing operations allocated to unvested shares
    1,195       —               693       —          
Less: Income from continuing operations re-allocated to unvested shares
    (1,188 )     —               (689 )     —          
Stock Options
    —       254               —       203          
 
                                       
Diluted EPS:
                                               
Income from continuing operations allocated to common shares, and assumed share conversions
  $ 62,750       42,619     $ 1.47     $ 35,467       37,995     $ 0.93