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Other Income, Net
 12 Months Ended
Dec. 31, 2011
Other Income, Net [Abstract]  
Other Income, Net
8. 
Other Income, Net

Other income (expense), net for the years ended Dec. 31 consisted of the following:

(Thousands of Dollars)
 
2011
  
2010
  
2009
 
Interest income
 $506  $250  $671 
Other nonoperating income
  11   57   68 
Life insurance policy expense
  (111)  (280)  (475)
Other income, net
 $406  $27  $264