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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2018
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, 2018
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
216,366

 
$
56,500

 
$
278

 
$
—

 
$
273,144

Intersegment revenues
 
109

 
148

 
—

 
(257
)
 
—

Total revenues
 
$
216,475

 
$
56,648

 
$
278

 
$
(257
)
 
$
273,144

Net income
 
$
20,444

 
$
10,399

 
$
574

 
$
—

 
$
31,417

(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


(a) 
Operating revenues include $38 million and $42 million of affiliate electric revenue for the three months ended March 31, 2018 and 2017, respectively.