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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2017
Segment Reporting [Abstract]  
Results from Operations by Reportable Segment
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 


 
 
 
 
 
 
 
 
 
 
 
(Thousands of Dollars)
 
Regulated
Electric
 
Regulated
Natural Gas
 
All Other
 
Reconciling
Eliminations
 
Consolidated
Total
Three Months Ended March 31, 2017
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
216,309

 
$
48,347

 
$
275

 
$
—

 
$
264,931

Intersegment revenues
 
96

 
114

 
—

 
(210
)
 
—

Total revenues
 
$
216,405

 
$
48,461

 
$
275

 
$
(210
)
 
$
264,931

Net income
 
$
15,470

 
$
6,545

 
$
404

 
$
—

 
$
22,419


 
 
 
 
 
 
 
 
 
 
 
(Thousands of Dollars)
 
Regulated
Electric
 
Regulated
Natural Gas
 
All Other
 
Reconciling
Eliminations
 
Consolidated
Total
Three Months Ended March 31, 2016
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
211,524

 
$
43,020

 
$
306

 
$
—

 
$
254,850

Intersegment revenues
 
109

 
80

 
—

 
(189
)
 
—

Total revenues
 
$
211,633

 
$
43,100

 
$
306

 
$
(189
)
 
$
254,850

Net income
 
$
11,501

 
$
6,092

 
$
38

 
$
—

 
$
17,631

(a) 
Operating revenues include $42 million and $41 million of affiliate electric revenue for the three months ended March 31, 2017 and 2016, respectively.