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Business segment data
 6 Months Ended
Jun. 30, 2015
Segment Reporting [Abstract]  
Business segment data
Business segment data
The Company's reportable segments are those that are based on the Company's method of internal reporting, which generally segregates the strategic business units due to differences in products, services and regulation. The internal reporting of these operating segments is defined based on the reporting and review process used by the Company's chief executive officer. The vast majority of the Company's operations are located within the United States.

The electric segment generates, transmits and distributes electricity in Montana, North Dakota, South Dakota and Wyoming. The natural gas distribution segment distributes natural gas in those states as well as in Idaho, Minnesota, Oregon and Washington. These operations also supply related value-added services.

The pipeline and energy services segment provides natural gas transportation, underground storage, processing and gathering services, as well as oil gathering, through regulated and nonregulated pipeline systems and processing facilities primarily in the Rocky Mountain and northern Great Plains regions of the United States. This segment recently commenced operations of Dakota Prairie Refinery in conjunction with Calumet to refine crude oil. The facility produces and sells diesel fuel, naphtha and ATBs. This segment also provides cathodic protection and other energy-related services.

The construction materials and contracting segment mines aggregates and markets crushed stone, sand, gravel and related construction materials, including ready-mixed concrete, cement, asphalt, liquid asphalt and other value-added products. It also performs integrated contracting services. This segment operates in the central, southern and western United States and Alaska and Hawaii.

The construction services segment provides utility construction services specializing in constructing and maintaining electric and communications lines, gas pipelines, fire suppression systems, and external lighting and traffic signalization. This segment also provides utility excavation and inside electrical and mechanical services, and manufactures and distributes transmission line construction equipment and supplies.

The Other category includes the activities of Centennial Capital, which insures various types of risks as a captive insurer for certain of the Company's subsidiaries. The function of the captive insurer is to fund the deductible layers of the insured companies' general liability, automobile liability and pollution liability coverages. Centennial Capital also owns certain real and personal property. The Other category also includes certain general and administrative costs (reflected in operation and maintenance expense) and interest expense which were previously allocated to Fidelity and do not meet the criteria for income (loss) from discontinued operations. The Other category also included Centennial Resources' investment in the Brazilian Transmission Lines.

Discontinued operations includes the results of Fidelity other than certain general and administrative costs and interest expense as described above. Fidelity is engaged in oil and natural gas development and production activities in the Rocky Mountain and Mid-Continent/Gulf States regions of the United States. The Company has begun marketing Fidelity and plans to exit that line of business. Discontinued operations also includes legal expenses and a benefit related to the vacation of an arbitration award in 2014 related to Centennial Resources. For more information on discontinued operations, see Note 9.

The information below follows the same accounting policies as described in Note 1 of the Company's Notes to Consolidated Financial Statements in the 2014 Annual Report. Information on the Company's businesses was as follows:
 
Three Months Ended
Six Months Ended
 
June 30,
June 30,
 
2015
2014
2015
2014
 
(In thousands)
External operating revenues:
 
 
 
 
Regulated operations:
 
 
 
 
Electric
$
64,265

$
65,149

$
136,041

$
138,796

Natural gas distribution
132,965

146,077

463,538

520,311

Pipeline and energy services
18,242

15,246

22,183

19,668

 
215,472

226,472

621,762

678,775

Nonregulated operations:
 
 
 
 
Pipeline and energy services
63,131

16,044

77,834

29,859

Construction materials and contracting
495,640

434,452

701,298

598,875

Construction services
211,515

275,109

446,918

545,002

Other
457

487

752

815

 
770,743

726,092

1,226,802

1,174,551

Total external operating revenues
$
986,215

$
952,564

$
1,848,564

$
1,853,326

 
 
 
 
 
Intersegment operating revenues:
 

 

 

 

Regulated operations:
 
 
 
 
Electric
$
—

$
—

$
—

$
—

Natural gas distribution
—

—

—

—

Pipeline and energy services
6,564

6,937

27,625

24,210

 
6,564

6,937

27,625

24,210

Nonregulated operations:
 
 
 
 
Pipeline and energy services
110

177

316

371

Construction materials and contracting
1,257

8,106

2,205

12,123

Construction services
3,491

7,273

15,186

11,010

Other
1,792

1,744

3,563

3,468

 
6,650

17,300

21,270

26,972

Intersegment eliminations
(13,214
)
(24,237
)
(48,895
)
(51,182
)
Total intersegment operating revenues
$
—

$
—

$
—

$
—

 
 
 
 
 
 
Three Months Ended
Six Months Ended
 
June 30,
June 30,
 
2015
2014
2015
2014
 
(In thousands)
Earnings (loss) on common stock:
 

 

 

 

Regulated operations:
 
 
 
 
Electric
$
5,910

$
7,823

$
14,237

$
18,856

Natural gas distribution
(5,375
)
(4,494
)
16,075

22,768

Pipeline and energy services
4,329

3,614

9,685

6,612

 
4,864

6,943

39,997

48,236

Nonregulated operations:
 
 
 
 
Pipeline and energy services
(5,933
)
2,175

(7,271
)
3,526

Construction materials and contracting
20,136

10,554

5,501

(13,019
)
Construction services
7,003

14,307

11,763

30,875

Other
(3,746
)
(2,971
)
(8,158
)
(6,758
)
 
17,460

24,065

1,835

14,624

Intersegment eliminations
(684
)
(954
)
(1,675
)
(1,427
)
Earnings on common stock before income (loss)
from discontinued operations
21,640

30,054

40,157

61,433

Income (loss) from discontinued operations, net of tax
(251,415
)
23,881

(576,020
)
48,993

Total earnings (loss) on common stock
$
(229,775
)
$
53,935

$
(535,863
)
$
110,426