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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2016
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, 2016
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)(b)
 
$
717,462

 
$
328,494

 
$
11,885

 
$
—

 
$
1,057,841

Intersegment revenues
 
81

 
45

 
—

 
(126
)
 
—

Total revenues
 
$
717,543

 
$
328,539

 
$
11,885

 
$
(126
)
 
$
1,057,841

Net income
 
$
72,536

 
$
40,890

 
$
2,448

 
$
—

 
$
115,874


(Thousands of Dollars)
 
Regulated Electric
 
Regulated Natural Gas
 
All Other
 
Reconciling Eliminations
 
Consolidated Total
Three Months Ended March 31, 2015
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)(b)
 
$
749,461

 
$
373,203

 
$
12,786

 
$
—

 
$
1,135,450

Intersegment revenues
 
88

 
41

 
—

 
(129
)
 
—

Total revenues
 
$
749,549

 
$
373,244

 
$
12,786

 
$
(129
)
 
$
1,135,450

Net income (loss)
 
$
74,669

 
$
36,623

 
$
(326
)
 
$
—

 
$
110,966

(a)    Operating revenues include $2 million of affiliate electric revenue for the three months ended March 31, 2016 and 2015.
(b)    Operating revenues include $1 million of other affiliate revenue for the three months ended March 31, 2016 and 2015.