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Segments and Related Information (Tables)
12 Months Ended
Dec. 31, 2013
Segment Reporting [Abstract]  
Results from Continuing Operations by Reportable Segment
(Thousands of Dollars)
 
Regulated
Electric
 
Regulated
Natural Gas
 
All Other
 
Reconciling
Eliminations
 
Consolidated
Total
2013
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
789,168

 
$
132,867

 
$
1,003

 
$

 
$
923,038

Intersegment revenues
 
350

 
1,967

 

 
(2,317
)
 

Total revenues
 
$
789,518

 
$
134,834

 
$
1,003

 
$
(2,317
)
 
$
923,038

 
 
 
 
 
 
 
 
 
 
 
Depreciation and amortization
 
$
64,237

 
$
12,485

 
$
175

 
$

 
$
76,897

Interest charges and financing costs
 
22,966

 
2,749

 
101

 

 
25,816

Income tax expense (benefit)
 
33,691

 
4,623

 
(1,905
)
 

 
36,409

Net Income
 
51,334

 
6,501

 
1,633

 

 
59,468

(Thousands of Dollars)
 
Regulated
Electric
 
Regulated
Natural Gas
 
All Other
 
Reconciling
Eliminations
 
Consolidated
Total
2012
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
757,565

 
$
103,100

 
$
1,177

 
$

 
$
861,842

Intersegment revenues
 
355

 
727

 

 
(1,082
)
 

Total revenues
 
$
757,920

 
$
103,827

 
$
1,177

 
$
(1,082
)
 
$
861,842

 
 
 
 
 
 
 
 
 
 
 
Depreciation and amortization
 
$
59,768

 
$
9,251

 
$
215

 
$

 
$
69,234

Interest charges and financing costs
 
20,303

 
2,554

 
80

 

 
22,937

Income tax expense
 
27,164

 
2,113

 
281

 

 
29,558

Net Income
 
45,377

 
3,094

 
1,480

 

 
49,951

(Thousands of Dollars)
 
Regulated
Electric
 
Regulated
Natural Gas
 
All Other
 
Reconciling
Eliminations
 
Consolidated
Total
2011
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
755,136

 
$
119,447

 
$
1,207

 
$

 
$
875,790

Intersegment revenues
 
405

 
1,581

 

 
(1,986
)
 

Total revenues
 
$
755,541

 
$
121,028

 
$
1,207

 
$
(1,986
)
 
$
875,790

 
 
 
 
 
 
 
 
 
 
 
Depreciation and amortization
 
$
58,800

 
$
9,599

 
$
175

 
$

 
$
68,574

Interest charges and financing costs
 
21,181

 
2,675

 
137

 

 
23,993

Income tax expense (benefit)
 
32,656

 
1,995

 
(1,037
)
 

 
33,614

Net Income
 
47,093

 
2,964

 
949

 

 
51,006


(a) 
Operating revenues include $137 million, $125 million and $124 million of intercompany revenue for the years ended Dec. 31, 2013, 2012 and 2011, respectively. See Note 15 for further discussion of related party transactions by operating segment.