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Comprehensive Income
9 Months Ended
Sep. 30, 2011
Comprehensive Income [Abstract] 
Comprehensive Income
11.
Comprehensive Income

The components of total comprehensive income are shown below:

   
Three Months Ended Sept. 30,
 
(Thousands of Dollars)
 
2011
  
2010
 
Net income
 $140,718  $158,091 
Other comprehensive (loss) income:
        
After-tax net unrealized (losses) gains related to derivatives accounted for as hedges
  (14,428)  13 
After-tax net realized gains on derivative transactions reclassified into earnings
  (381)  (126)
Other comprehensive loss
  (14,809)  (113)
Comprehensive income
 $125,909  $157,978 


   
Nine Months Ended Sept. 30,
 
(Thousands of Dollars)
 
2011
  
2010
 
Net income
 $308,366  $320,026 
Other comprehensive loss:
        
After-tax net unrealized losses related to derivatives accounted for as hedges
  (14,346)  (95)
After-tax net realized gains on derivative transactions reclassified into earnings
  (1,127)  (415)
Other comprehensive loss
  (15,473)  (510)
Comprehensive income
 $292,893  $319,516