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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,
  
Nine Months Ended Sept. 30,
 
(Thousands of Dollars)
 
2011
  
2010
  
2011
  
2010
 
Net income
 $48,581  $39,189  $83,491  $71,284 
Other comprehensive income:
                
After-tax net realized losses on derivative transactions reclassified into earnings
  42   44   128   129 
Comprehensive income
 $48,623  $39,233  $83,619  $71,413