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Rate and Regulatory Matters (Tables)
12 Months Ended
Dec. 31, 2012
Rate And Regulatory Matters Tables  
Regulatory Assets

   (Thousands of Dollars)     
   December 31,   Remaining 
   Regulatory Assets  2012   2011   Recovery  Periods 
Postretirement Benefits  $53,142   $49,735    Various 
Income Taxes   17,866    17,151    Various 
Rate Cases, Storm Costs, Tank Painting, and Other   1,823    416    2-9 years 
Total  $72,831   $67,302