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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2011
Earnings Per Share [Abstract]  
Reconciliation of the numerators and denominators used in the calculation of Basic and Diluted EPS
                                                 
    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