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Business segment data
 9 Months Ended
Sep. 30, 2013
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 Company also has an investment in a foreign country, which consists of Centennial Resources' investment in ECTE.

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 is constructing Dakota Prairie Refinery to refine crude oil and also provides cathodic protection and other energy-related services.

The exploration and production segment is engaged in oil and natural gas acquisition, exploration, development and production activities in the Rocky Mountain and Mid-Continent regions of the United States and in and around the Gulf of Mexico.

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 specializes in constructing and maintaining electric and communication lines, gas pipelines, fire suppression systems, and external lighting and traffic signalization equipment. This segment also provides utility excavation services and inside electrical wiring, cabling and mechanical services, sells and distributes electrical materials, and manufactures and distributes specialty equipment.

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 Centennial Resources' investment in ECTE.

The information below follows the same accounting policies as described in Note 1 of the Company's Notes to Consolidated Financial Statements in the 2012 Annual Report. Information on the Company's businesses was as follows:
Three Months Ended September 30, 2013
External
Operating
Revenues
Inter-
segment
Operating
Revenues
Earnings
on Common
Stock
 
(In thousands)
Electric
$
68,314

$
—

$
11,417

Natural gas distribution
77,417

—

(11,204
)
Pipeline and energy services
46,372

4,906

5,310

 
192,103

4,906

5,523

Exploration and production
119,234

10,714

17,434

Construction materials and contracting
706,982

7,422

49,159

Construction services
267,038

3,097

12,154

Other
425

1,859

1,217

 
1,093,679

23,092

79,964

Intersegment eliminations
—

(27,998
)
(1,202
)
Total
$
1,285,782

$
—

$
84,285



Three Months Ended September 30, 2012
External
Operating
Revenues
Inter-
segment
Operating
Revenues
Loss
on Common
Stock
 
(In thousands)
Electric
$
63,492

$
—

$
11,000

Natural gas distribution
80,069

—

(8,782
)
Pipeline and energy services
41,302

7,046

3,273

 
184,863

7,046

5,491

Exploration and production
100,380

8,076

(87,748
)
Construction materials and contracting
641,500

8,508

41,889

Construction services
246,358

834

9,863

Other
417

1,948

663

 
988,655

19,366

(35,333
)
Intersegment eliminations
—

(26,412
)
—

Total
$
1,173,518

$
—

$
(29,842
)
 
 
 
 
Nine Months Ended September 30, 2013
External
Operating
Revenues
Inter-
segment
Operating
Revenues
Earnings
on Common
Stock
 
(In thousands)
Electric
$
189,949

$
—

$
25,652

Natural gas distribution
536,756

—

15,420

Pipeline and energy services
116,965

31,623

1,247

 
843,670

31,623

42,319

Exploration and production
371,648

33,083

70,713

Construction materials and contracting
1,287,305

24,673

38,602

Construction services
774,103

7,011

36,733

Other
1,254

5,516

1,862

 
2,434,310

70,283

147,910

Intersegment eliminations
—

(101,906
)
(3,259
)
Total
$
3,277,980

$
—

$
186,970

 
 
 
 
Nine Months Ended September 30, 2012
External
Operating
Revenues
Inter-
segment
Operating
Revenues
Earnings
on Common
Stock
 
(In thousands)
Electric
$
174,410

$
—

$
22,977

Natural gas distribution
504,805

—

10,314

Pipeline and energy services
105,184

36,393

21,884

 
784,399

36,393

55,175

Exploration and production
289,106

25,114

(56,860
)
Construction materials and contracting
1,229,731

11,756

24,748

Construction services
688,368

1,078

29,951

Other
2,684

4,303

6,705

 
2,209,889

42,251

4,544

Intersegment eliminations
—

(78,644
)
—

Total
$
2,994,288

$
—

$
59,719



Earnings from electric, natural gas distribution and pipeline and energy services are substantially all from regulated operations. Earnings from exploration and production, construction materials and contracting, construction services and other are all from nonregulated operations.