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 midstream 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.

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 communication 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 other supplies.

The refining segment refines crude oil and produces and sells diesel fuel, naphtha, ATBs and other by-products of the production process. The refining segment includes Dakota Prairie Refinery which is jointly owned by WBI Energy and Calumet and is located in southwestern North Dakota, along with WBI Energy's other activity that supports the refinery.

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 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 includes Centennial Resources' former 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 engaged in oil and natural gas development and production activities in the Rocky Mountain and Mid-Continent/Gulf States regions of the United States. In the third and fourth quarters of 2015 and the first quarter of 2016, the Company entered into purchase and sale agreements to sell the vast majority of Fidelity's assets, comprising greater than 93 percent of total production for 2014. The completion of the majority of these sales occurred in the fourth quarter of 2015 and the Company continues to market the remaining assets of Fidelity. 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 2.

The information below follows the same accounting policies as described in the Summary of Significant Accounting Policies. Information on the Company's businesses as of December 31 and for the years then ended was as follows:



	2015			2014			2013
				(In thousands)
External operating revenues:
Regulated operations:
Electric	$	280,615		$	277,874		$	257,260
Natural gas distribution	817,419			921,986			851,945
Pipeline and midstream	50,238			46,786			47,633
	1,148,272			1,246,646			1,156,838
Nonregulated operations:
Pipeline and midstream	54,282			64,494			56,427
Construction materials and contracting	1,901,530			1,740,089			1,675,444
Construction services	907,767			1,062,055			1,029,909
Refining	178,262			—			—
Other	1,436			1,532			1,553
	3,043,277			2,868,170			2,763,333
Total external operating revenues	$	4,191,549		$	4,114,816		$	3,920,171

Intersegment operating revenues:
Electric	$	—		$	—		$	—
Natural gas distribution	—			—			—
Pipeline and midstream	51,716			46,085			40,511
Construction materials and contracting	2,752			25,241			36,693
Construction services	18,660			57,474			9,930
Refining	—			—			—
Other	7,755			7,832			8,067
Intersegment eliminations	(80,883		)	(136,632		)	(95,201		)
Total intersegment operating revenues	$	—		$	—		$	—

Depreciation, depletion and amortization:
Electric	$	37,583		$	35,008		$	32,789
Natural gas distribution	64,756			54,700			50,031
Pipeline and midstream	27,981			29,749			29,105
Construction materials and contracting	65,937			68,557			74,470
Construction services	13,420			12,874			11,939
Refining	16,463			896			14
Other	2,070			2,196			2,050
Intersegment eliminations	(480		)	—			—
Total depreciation, depletion and amortization	$	227,730		$	203,980		$	200,398

Interest expense:
Electric	$	17,421		$	15,595		$	12,590
Natural gas distribution	29,471			27,217			25,123
Pipeline and midstream	9,895			9,946			10,148
Construction materials and contracting	15,183			16,368			17,394
Construction services	3,959			4,176			4,306
Refining	3,450			119			182
Other	14,292			13,739			14,216
Intersegment eliminations	(603		)	(254		)	(156		)
Total interest expense	$	93,068		$	86,906		$	83,803



	2015			2014			2013
				(In thousands)
Income taxes:
Electric	$	11,523		$	12,442		$	9,683
Natural gas distribution	11,377			11,350			16,633
Pipeline and midstream	7,505			12,232			3,466
Construction materials and contracting	41,619			18,586			24,765
Construction services	16,432			24,753			29,504
Refining	(13,815		)	(2,533		)	(76		)
Other	(8,107		)	(9,798		)	(6,812		)
Intersegment eliminations	(931		)	(3,805		)	(2,869		)
Total income taxes	$	65,603		$	63,227		$	74,294

Earnings (loss) on common stock:
Regulated operations:
Electric	$	35,914		$	36,731		$	34,837
Natural gas distribution	23,607			30,484			37,656
Pipeline and midstream	20,680			15,440			15,388
	80,201			82,655			87,881
Nonregulated operations:
Pipeline and midstream	(7,430		)	9,226			(7,687		)
Construction materials and contracting	89,096			51,510			50,946
Construction services	23,762			54,432			52,213
Refining	(22,457		)	(2,038		)	(72		)
Other	(12,376		)	(7,317		)	(10,605		)
	70,595			105,813			84,795
Intersegment eliminations	(1,531		)	(6,095		)	(4,307		)
Earnings on common stock before income (loss) from discontinued operations	149,265			182,373			168,369
Income (loss) from discontinued operations, net of tax	(772,385		)	115,175			109,879
Total earnings (loss) on common stock	$	(623,120	)	$	297,548		$	278,248

Capital expenditures:
Electric	$	332,876		$	185,121		$	168,557
Natural gas distribution	130,793			120,613			101,279
Pipeline and midstream	18,315			61,754			40,533
Construction materials and contracting	48,126			37,896			34,607
Construction services	38,269			26,942			15,102
Refining	22,052			115,655			86,559
Other	3,755			2,131			2,249
Net proceeds from sale or disposition of property and other	(63,831		)	(60,177		)	(28,392		)
Total net capital expenditures	$	530,355		$	489,935		$	420,494

Assets:
Electric*	$	1,327,258		$	1,030,611		$	884,283
Natural gas distribution*	2,042,925			1,931,908			1,786,068
Pipeline and midstream	593,025			655,735			620,639
Construction materials and contracting	1,279,057			1,272,231			1,305,808
Construction services	450,896			454,602			450,614
Refining	464,699			429,102			178,062
Other**	278,433			306,572			236,543
Assets held for sale	191,315			1,751,647			1,611,430
Total assets	$	6,627,608		$	7,832,408		$	7,073,447



	2015			2014			2013
				(In thousands)
Property, plant and equipment:
Electric*	$	1,786,148		$	1,457,101		$	1,315,822
Natural gas distribution*	2,076,581			1,904,759			1,776,901
Pipeline and midstream	758,729			818,388			789,569
Construction materials and contracting	1,553,428			1,529,942			1,510,355
Construction services	163,279			144,395			134,948
Refining	445,333			401,845			172,603
Other	49,537			50,937			49,997
Eliminations	(15,367		)	(12,589		)	(4,473		)
Less accumulated depreciation, depletion and amortization	2,506,571			2,386,113			2,284,169
Net property, plant and equipment	$	4,311,097		$	3,908,665		$	3,461,553


*	Includes allocations of common utility property.


**	Includes assets not directly assignable to a business (i.e. cash and cash equivalents, certain accounts receivable, certain investments and other miscellaneous current and deferred assets).

Capital expenditures for 2015, 2014 and 2013 include noncash capital expenditure-related accounts payable and exclude capital expenditures of the noncontrolling interest related to Dakota Prairie Refinery. The net transactions were $(40.5) million in 2015, $(88.8) million in 2014 and $(70.0) million in 2013.