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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2011
Income Taxes [Abstract] 
Income tax (benefit) expense from continuing operations
     Income tax expense from continuing operations was as follows (in thousands):
                                 
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
    2011     2010     2011     2010  
Income tax expense
  $ 22,540     $ 784     $ 35,346     $ 61,559  
Effective tax rate
    40.4 %     22.8 %     43.7 %     38.6 %