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Comprehensive Income
6 Months Ended
Jun. 30, 2011
Comprehensive Income [Abstract]  
Comprehensive Income
11.
Comprehensive Income

The components of total comprehensive income are shown below:

   
Three Months Ended June 30,
  
Six Months Ended June 30,
 
(Thousands of Dollars)
 
2011
  
2010
  
2011
  
2010
 
Net income
 $8,478  $2,679  $23,121  $16,223 
Other comprehensive income:
                
After-tax net realized losses on derivative transactions reclassified into earnings
  19   19   38   38 
Comprehensive income
 $8,497  $2,698  $23,159  $16,261