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Segment and Related Information
12 Months Ended
Dec. 31, 2019
Segment Reporting [Abstract]  
Segment and Related Information
(20)          Segment and Related Information

Our reportable business segments are primarily engaged in the electric and natural gas business. The remainder of our operations are presented as other, which primarily consists of unallocated corporate costs and unregulated activity.

We evaluate the performance of these segments based on gross margin. The accounting policies of the operating segments are the same as the parent except that the parent allocates some of its operating expenses to the operating segments according to a methodology designed by management for internal reporting purposes and involves estimates and assumptions.

Financial data for the business segments for the twelve months ended are as follows (in thousands):
December 31, 2019
Electric
 
Gas
 
Other
 
Eliminations
 
Total
Operating revenues
$
981,178

 
$
276,732

 
$
—

 
$
—

 
$
1,257,910

Cost of sales
239,589

 
78,431

 
—

 
—

 
318,020

Gross margin
741,589

 
198,301

 
—

 
—

 
939,890

Operating, general and administrative
232,424

 
82,732

 
3,073

 
—

 
318,229

Property and other taxes
134,686

 
37,192

 
10

 
—

 
171,888

Depreciation and depletion
143,262

 
29,661

 
—

 
—

 
172,923

Operating income (loss)
231,217

 
48,716

 
(3,083
)
 
—

 
276,850

Interest expense, net
(78,809
)
 
(6,218
)
 
(10,041
)
 
—

 
(95,068
)
Other (expense) income, net
(1,365
)
 
(814
)
 
2,592

 
—

 
413

Income tax (expense) benefit
(6,079
)
 
493

 
25,511

 
—

 
19,925

Net income
$
144,964

 
$
42,177

 
$
14,979

 
$
—

 
$
202,120

Total assets
$
4,685,990

 
$
1,220,048

 
$
4,664

 
$
—

 
$
5,910,702

Capital expenditures
$
241,190

 
$
74,826

 
$
—

 
$
—

 
$
316,016


December 31, 2018
Electric
 
Gas
 
Other
 
Eliminations
 
Total
Operating revenues
$
921,093

 
$
270,916

 
$
—

 
$
—

 
$
1,192,009

Cost of sales
194,608

 
78,275

 
—

 
—

 
272,883

Gross margin
726,485

 
192,641

 
—

 
—

 
919,126

Operating, general and administrative
223,598

 
82,864

 
657

 
—

 
307,119

Property and other taxes
134,681

 
36,569

 
9

 
—

 
171,259

Depreciation and depletion
144,636

 
29,822

 
18

 
—

 
174,476

Operating income (loss)
223,570

 
43,386

 
(684
)
 
—

 
266,272

Interest expense, net
(79,033
)
 
(5,858
)
 
(7,097
)
 
—

 
(91,988
)
Other income, net
2,794

 
962

 
210

 
—

 
3,966

Income tax benefit (expense)
21,686

 
9,268

 
(12,244
)
 
—

 
18,710

Net income (loss)
$
169,017

 
$
47,758

 
$
(19,815
)
 
$
—

 
$
196,960

Total assets
$
4,512,392

 
$
1,127,252

 
$
4,732

 
$
—

 
$
5,644,376

Capital expenditures
$
221,968

 
$
61,998

 
$
—

 
$
—

 
$
283,966


December 31, 2017
Electric
 
Gas
 
Other
 
Eliminations
 
Total
Operating revenues
$
1,037,053

 
$
268,599

 
$
—

 
$
—

 
$
1,305,652

Cost of sales
334,029

 
76,320

 
—

 
—

 
410,349

Gross margin
703,024

 
192,279

 
—

 
—

 
895,303

Operating, general and administrative
216,003

 
78,757

 
43

 
—

 
294,803

Property and other taxes
127,391

 
35,214

 
9

 
—

 
162,614

Depreciation and depletion
136,556

 
29,548

 
33

 
—

 
166,137

Operating income (loss)
223,074

 
48,760

 
(85
)
 
—

 
271,749

Interest expense, net
(82,454
)
 
(5,920
)
 
(3,889
)
 
—

 
(92,263
)
Other (loss) income, net
(3,487
)
 
(878
)
 
950

 
—

 
(3,415
)
Income tax (expense) benefit
(7,424
)
 
(6,684
)
 
740

 
—

 
(13,368
)
Net income (loss)
$
129,709

 
$
35,278

 
$
(2,284
)
 
$
—

 
$
162,703

Total assets
$
4,346,484

 
$
1,071,847

 
$
2,586

 
$
—

 
$
5,420,917

Capital expenditures
$
226,077

 
$
50,361

 
$
—

 
$
—

 
$
276,438