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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2011
Earnings Per Share  
Calculation Of Basic And Diluted Earnings Per Share
   
Three Months Ended
   
Six Months Ended
 
   
June 30,
   
June 30,
 
   
2011
   
2010
   
2011
   
2010
 
Net income
  $ 14,701     $ 20,137     $ 29,214     $ 38,279  
                                 
Denominator for basic earnings per share - weighted-average number of common shares outstanding during the period
    60,159       62,695       60,537       63,047  
Incremental common shares attributable to exercise of outstanding dilutive options
    313       450       413       457  
Incremental common shares attributable to outstanding restricted shares, restricted stock units and phantom stock
    95       98       175       94  
Denominator for diluted earnings per share
    60,567       63,243       61,125       63,598  
                                 
Basic earnings per share
  $ 0.24     $ 0.32     $ 0.48     $ 0.61  
Diluted earnings per share
  $ 0.24     $ 0.32     $ 0.48     $ 0.60