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Segment Information Segment Information (Tables)
12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
The following table presents information about our reportable segments.
 
For the Year Ended December 31,
 
2018
 
2017
 
2016
(in thousands)
 
 
 
 
 
Operating Revenues, Unaffiliated Customers
 
 
 
 
 
Regulated Energy
$
332,749

 
$
316,971

 
$
302,402

Unregulated Energy
384,740

 
300,612

 
196,458

Total operating revenues, unaffiliated customers
$
717,489

 
$
617,583

 
$
498,860

Intersegment Revenues (1)
 
 
 
 
 
Regulated Energy
$
12,532

 
$
9,339

 
$
3,287

Unregulated Energy
35,877

 
23,983

 
7,321

Other businesses
653

 
774

 
880

Total intersegment revenues
$
49,062

 
$
34,096

 
$
11,488

Operating Income
 
 
 
 
 
Regulated Energy
$
79,215

 
$
74,584

 
$
71,515

Unregulated Energy
16,901

 
12,631

 
14,066

Other businesses and eliminations
(1,496
)
 
205

 
402

Operating Income
94,620

 
87,420

 
85,983

Other expense
(615
)
 
(2,342
)
 
(2,328
)
Interest charges
16,431

 
12,645

 
10,639

Income Before Income taxes
77,574

 
72,433

 
73,016

Income taxes
20,994

 
14,309

 
28,341

Net Income
$
56,580

 
$
58,124

 
$
44,675

Depreciation and Amortization
 
 
 
 
 
Regulated Energy
$
31,876

 
$
28,554

 
$
25,677

Unregulated Energy
8,845

 
7,954

 
6,386

Other businesses and eliminations
81

 
91

 
96

Total depreciation and amortization
$
40,802

 
$
36,599

 
$
32,159

Capital Expenditures
 
 
 
 
 
Regulated Energy
$
235,912

 
$
159,011

 
$
139,994

Unregulated Energy
38,700

 
26,190

 
23,984

Other businesses
8,364

 
5,902

 
5,398

Total capital expenditures
$
282,976


$
191,103

 
$
169,376

 
(1) All significant intersegment revenues are billed at market rates and have been eliminated from consolidated revenues.

 
As of December 31,
 
2018
 
2017
Identifiable Assets
 
 
 
Regulated Energy
$
1,345,805

 
$
1,121,673

Unregulated Energy
306,045

 
259,041

Other businesses
41,821

 
34,220

Total identifiable assets
$
1,693,671

 
$
1,414,934