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Other Income, Net
 12 Months Ended
Dec. 31, 2011
Other Income, Net [Abstract]  
Other Income, Net
7.
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
 $324  $1,190  $1,186 
Other nonoperating income
  67   459   107 
Life insurance policy expense
  (283)  (384)  (566)
Other nonoperating expense
  (10)  -   - 
Other income, net
 $98  $1,265  $727