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Other Income, Net
 12 Months Ended
Dec. 31, 2011
Other Income, Net [Abstract]  
Other Income, Net
9.    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
 $4,860  $3,296  $3,247 
COLI settlement (See Note 7)
  -   25,000   - 
Other nonoperating income
  2,512   1,758   3,192 
Life insurance policy expense
  (359)  (937)  (1,348)
Other nonoperating expense
  (12)  -   (395)
Other income, net
 $7,001  $29,117  $4,696