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Income Taxes
9 Months Ended
Sep. 30, 2014
Income Tax Disclosure [Abstract]  
Income Taxes

(5) INCOME TAXES

Income tax expense from operations was as follows (in thousands):

 

Three Months Ended
September 30,

 

 

Nine Months Ended
September 30,

 

 

2014

 

 

2013

 

 

2014

 

 

2013

 

Income tax expense

$

93,522

 

 

$

11,866

 

 

$

230,455

 

 

$

62,180

 

Effective tax rate

 

39.0

%

 

 

38.2

%

 

 

39.7

%

 

 

41.5

%

 

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 third quarter and the nine months ended September 30, 2014 and 2013, our overall effective tax rate on operations was different than the federal statutory rate of 35% due primarily to state income taxes, valuation allowances and other permanent differences.