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Segment Information (Tables)
3 Months Ended
Mar. 31, 2013
Segment Information [Abstract]  
Results from Continuing Operations by Reportable Segment
   
Regulated
 
Regulated
 
All
 
Reconciling
 
Consolidated
 
(Thousands of Dollars)
 
Electric
  
Natural Gas
  
Other
  
Eliminations
  
Total
 
Three Months Ended March 31, 2013
               
Operating revenues from external customers
 $721,348  $383,924  $12,185  $-  $1,117,457 
Intersegment revenues
  88   47   -   (135)  - 
Total revenues
 $721,436  $383,971  $12,185  $(135) $1,117,457 
Net income
 $78,468  $33,799  $4,338  $-  $116,605 
 
   
Regulated
 
Regulated
 
All
 
Reconciling
 
Consolidated
 
(Thousands of Dollars)
 
Electric
  
Natural Gas
  
Other
  
Eliminations
  
Total
 
Three Months Ended March 31, 2012
                    
Operating revenues from external customers
 $682,279  $383,004  $10,769  $-  $1,076,052 
Intersegment revenues
  92   55   -   (147)  - 
Total revenues
 $682,371  $383,059  $10,769  $(147) $1,076,052 
Net income
 $61,333  $28,310  $3,642  $-  $93,285