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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2011
Income Taxes (Tables) [Abstract]  
Tax rate
 
 
Three Months Ended
June 30,
 
Percentage
Point
 
 
2011
 
2010
 
Increase (Decrease)
Reported tax rate
 
7.6
%
 
17.6
%
 
(10.0
)%
Impact of certain receipts/charges*
 
9.8
%
 
6.2
%
 
3.6
 %
 
 
17.4
%
 
23.8
%
 
(6.4
)%


 
 
Six Months Ended
June 30,
 
Percentage
Point
 
 
2011
 
2010
 
Increase (Decrease)
Reported tax rate
 
55.5
 %
 
(2.4
)%
 
57.9
 %
Impact of certain receipts/charges*
 
(40.0
)%
 
24.8
 %
 
(64.8
)%
 
 
15.5
 %
 
22.4
 %
 
(6.9
)%