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Segment Information (Tables)
 9 Months Ended
Sep. 30, 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 Sept. 30, 2017
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
232,802

 
$
14,394

 
$
315

 
$
—

 
$
247,511

Intersegment revenues
 
144

 
56

 
—

 
(200
)
 
—

Total revenues
 
$
232,946

 
$
14,450

 
$
315

 
$
(200
)
 
$
247,511

Net income (loss)
 
$
24,594

 
$
(2,184
)
 
$
(85
)
 
$
—

 
$
22,325

(Thousands of Dollars)
 
Regulated Electric
 
Regulated Natural Gas
 
All Other
 
Reconciling Eliminations
 
Consolidated Total
Three Months Ended Sept. 30, 2016
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
232,216

 
$
13,646

 
$
282

 
$
—

 
$
246,144

Intersegment revenues
 
110

 
97

 
—

 
(207
)
 
—

Total revenues
 
$
232,326

 
$
13,743

 
$
282

 
$
(207
)
 
$
246,144

Net income (loss)
 
$
25,459

 
$
(1,201
)
 
$
(37
)
 
$
—

 
$
24,221


(a) 
Operating revenues include $46 million and $44 million of affiliate electric revenue for the three months ended Sept. 30, 2017 and 2016, respectively.
(Thousands of Dollars)
 
Regulated
Electric
 
Regulated
Natural Gas
 
All Other
 
Reconciling
Eliminations
 
Consolidated
Total
Nine Months Ended Sept. 30, 2017
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
659,853

 
$
81,768

 
$
847

 
$
—

 
$
742,468

Intersegment revenues
 
363

 
238

 
—

 
(601
)
 
—

Total revenues
 
$
660,216

 
$
82,006

 
$
847

 
$
(601
)
 
$
742,468

Net income
 
$
54,580

 
$
3,388

 
$
1,017

 
$
—

 
$
58,985

(Thousands of Dollars)
 
Regulated
Electric
 
Regulated
Natural Gas
 
All Other
 
Reconciling
Eliminations
 
Consolidated
Total
Nine Months Ended Sept. 30, 2016
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
646,619

 
$
72,671

 
$
877

 
$
—

 
$
720,167

Intersegment revenues
 
317

 
299

 
—

 
(616
)
 
—

Total revenues
 
$
646,936

 
$
72,970

 
$
877

 
$
(616
)
 
$
720,167

Net income
 
$
52,058

 
$
2,426

 
$
(7
)
 
$
—

 
$
54,477

(a) 
Operating revenues include $131 million and $127 million of affiliate electric revenue for the nine months ended Sept. 30, 2017 and 2016, respectively.