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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2012
Income Taxes (Tables) [Abstract]  
Tax rate
The following tables provide a summary of our reported tax rate:
 
 
Three Months Ended
September 30,
 
 
2012
 
2011
Reported tax rate
 
(0.1
)%
 
(27.9
)%
Impact of certain receipts/charges*
 
16.2
 %
 
48.0
 %
 
 
16.1
 %
 
20.1
 %

 
 
Nine Months Ended
September 30,
 
 
2012
 
2011
Reported tax rate
 
0.7
%
 
38.4
 %
Impact of certain receipts/charges*
 
14.5
%
 
(21.8
)%
 
 
15.2
%
 
16.6
 %
*These receipts/charges are taxed at different rates than our effective tax rate.