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Other Income, Net
3 Months Ended
Mar. 31, 2012
Other Income, Net [Abstract]  
Other Income, Net
8.      Other Income, Net
 
Other income (expense), net consisted of the following:

   
Three Months Ended March 31
 
(Thousands of Dollars)
 
2012
  
2011
 
Interest income
 $657  $171 
Insurance policy expense
  (150)  (76)
Other nonoperating expense
  (7)  (21)
Other income, net
 $500  $74