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Business segment data
 3 Months Ended
Mar. 31, 2014
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 in conjunction with Calumet 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/Gulf States regions of the United States.

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 2013 Annual Report. Information on the Company's businesses was as follows:
Three Months Ended March 31, 2014
External
Operating
Revenues
Inter-
segment
Operating
Revenues
Earnings
on Common
Stock
 
(In thousands)
Electric
$
73,647

$
—

$
11,033

Natural gas distribution
374,233

—

27,263

Pipeline and energy services
43,661

18,276

4,349

 
491,541

18,276

42,645

Exploration and production
116,669

20,867

20,939

Construction materials and contracting
164,423

4,017

(23,574
)
Construction services
269,892

3,738

16,568

Other
328

1,724

264

 
551,312

30,346

14,197

Intersegment eliminations
—

(48,622
)
(351
)
Total
$
1,042,853

$
—

$
56,491



Three Months Ended March 31, 2013
External
Operating
Revenues
Inter-
segment
Operating
Revenues
Earnings
on Common
Stock
 
(In thousands)
Electric
$
64,654

$
—

$
9,825

Natural gas distribution
331,754

—

32,518

Pipeline and energy services
27,716

18,718

2,330

 
424,124

18,718

44,673

Exploration and production
115,363

9,812

20,284

Construction materials and contracting
161,977

4,294

(20,582
)
Construction services
229,806

1,574

11,664

Other
334

1,818

305

 
507,480

17,498

11,671

Intersegment eliminations
—

(36,216
)
—

Total
$
931,604

$
—

$
56,344

 
 
 
 
 
 
 
 

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.