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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2013
Income Taxes (Tables) [Abstract]  
Tax rate
The following tables provide a summary of our reported tax rate:
 
 
Three Months Ended
September 30,
 
 
2013
 
2012
Reported tax rate
 
87.6
 %
 
(0.1
)%
Impact of certain receipts/charges*
 
(74.5
)%
 
16.2
 %
 
 
13.1
 %
 
16.1
 %
 
 
 
 
 
 
 
Nine Months Ended
September 30,
 
 
2013
 
2012
Reported tax rate
 
18.9
 %
 
0.7
%
Impact of certain receipts/charges*
 
(5.2
)%
 
14.5
%
 
 
13.7
 %
 
15.2
%
*These receipts/charges are taxed at different rates than our effective tax rate.