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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2013
Income Taxes (Tables) [Abstract]  
Tax rate
The following tables provide a summary of our reported tax rate:
 
 
Three Months Ended
March 31,
 
 
2013
 
2012
Reported tax rate
 
10.2
%
 
7.7
%
Impact of certain receipts/charges*
 
3.0
%
 
7.3
%
 
 
13.2
%
 
15.0
%
 
 
 
 
 
*These receipts/charges are taxed at different rates than our effective tax rate.