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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2011
Income Taxes (Tables) [Abstract] 
Tax rate
 
 
Three Months Ended
September 30,
 
Percentage
Point
 
 
2011
 
2010
 
Increase (Decrease)
Reported tax rate
 
(27.9
)%
 
(16.6
)%
 
(11.3
)%
Impact of certain receipts/charges*
 
48.0
 %
 
33.4
 %
 
14.6
 %
 
 
20.1
 %
 
16.8
 %
 
3.3
 %

 
 
Nine Months Ended
September 30,
 
Percentage
Point
 
 
2011
 
2010
 
Increase (Decrease)
Reported tax rate
 
38.4
 %
 
(0.7
)%
 
39.1
 %
Impact of certain receipts/charges*
 
(21.8
)%
 
20.9
 %
 
(42.7
)%
 
 
16.6
 %
 
20.2
 %
 
(3.6
)%