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Segment Information (Tables)
 6 Months Ended
Jun. 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 June 30, 2017
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
210,742

 
$
19,027

 
$
257

 
$
—

 
$
230,026

Intersegment revenues
 
123

 
68

 
—

 
(191
)
 
—

Total revenues
 
$
210,865

 
$
19,095

 
$
257

 
$
(191
)
 
$
230,026

Net income (loss)
 
$
14,516

 
$
(973
)
 
$
698

 
$
—

 
$
14,241

 
 
 
 
 
 
 
 
 
 
 
(Thousands of Dollars)
 
Regulated Electric
 
Regulated Natural Gas
 
All Other
 
Reconciling Eliminations
 
Consolidated Total
Three Months Ended June 30, 2016
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
202,879

 
$
16,005

 
$
289

 
$
—

 
$
219,173

Intersegment revenues
 
98

 
122

 
—

 
(220
)
 
—

Total revenues
 
$
202,977

 
$
16,127

 
$
289

 
$
(220
)
 
$
219,173

Net income (loss)
 
$
15,098

 
$
(2,465
)
 
$
(8
)
 
$
—

 
$
12,625


(a) 
Operating revenues include $43 million of affiliate electric revenue for the three months ended June 30, 2017 and 2016.
 
 
 
 
 
 
 
 
 
 
 
(Thousands of Dollars)
 
Regulated
Electric
 
Regulated
Natural Gas
 
All Other
 
Reconciling
Eliminations
 
Consolidated
Total
Six Months Ended June 30, 2017
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
427,051

 
$
67,374

 
$
532

 
$
—

 
$
494,957

Intersegment revenues
 
219

 
182

 
—

 
(401
)
 
—

Total revenues
 
$
427,270

 
$
67,556

 
$
532

 
$
(401
)
 
$
494,957

Net income
 
$
29,986

 
$
5,572

 
$
1,102

 
$
—

 
$
36,660

 
 
 
 
 
 
 
 
 
 
 
(Thousands of Dollars)
 
Regulated
Electric
 
Regulated
Natural Gas
 
All Other
 
Reconciling
Eliminations
 
Consolidated
Total
Six Months Ended June 30, 2016
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
414,403

 
$
59,025

 
$
595

 
$
—

 
$
474,023

Intersegment revenues
 
207

 
202

 
—

 
(409
)
 
—

Total revenues
 
$
414,610

 
$
59,227

 
$
595

 
$
(409
)
 
$
474,023

Net income
 
$
26,599

 
$
3,627

 
$
30

 
$
—

 
$
30,256

(a) 
Operating revenues include $85 million and $84 million of affiliate electric revenue for the six months ended June 30, 2017 and 2016, respectively.