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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2011
Income Taxes [Abstract]  
Income tax (benefit) expense from continuing operations
                                 
    Three Months Ended   Six Month Ended
    June 30,   June 30,
    2011   2010   2011   2010
 
                               
Income tax expense
  $ 32,703     $ 11,763     $ 12,806     $ 60,775  
Effective tax rate
    41.7 %     40.0 %     50.9 %     38.9 %