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Income Taxes
9 Months Ended
Sep. 30, 2011
Income Taxes [Abstract] 
INCOME TAXES
 
(6) INCOME TAXES
     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 %
     We compute our quarterly taxes under the effective tax rate method based on applying an anticipated annual effective rate to our year-to-date income, except for discrete items. Income taxes for discrete items are computed and recorded in the period that the specific transaction occurs. For the three months and the nine months ended September 30, 2011 and 2010, our overall effective tax rate on pre-tax income from continuing operations was different than the statutory rate of 35% due primarily to state income taxes, valuation allowances and other permanent differences.