At December 31, 2018, the Company had three reportable business segments: (i) contract drilling of oil and natural gas wells, (ii) pressure pumping services and (iii) directional drilling services. Each of these segments represents a distinct type of business and has a separate management team that reports to the Company’s chief operating decision maker. The results of operations in these segments are regularly reviewed by the chief operating decision maker for purposes of determining resource allocation and assessing performance.

Contract Drilling — The Company markets its contract drilling services to major and independent oil and natural gas operators. As of December 31, 2018, the Company had 252 marketed land-based drilling rigs in the continental United States and western Canada.

For the years ended December 31, 2018, 2017 and, 2016, contract drilling revenue earned in Canada was $9.3 million, $13.7 million and $15.6 million, respectively. Additionally, long-lived assets within the contract drilling segment located in Canada totaled $26.2 million and $52.0 million as of December 31, 2018 and 2017, respectively.

Pressure Pumping — The Company provides pressure pumping services to oil and natural gas operators primarily in Texas and the Mid-Continent and Appalachian regions. Substantially all of the revenue in the pressure pumping segment is from well stimulation services (such as hydraulic fracturing) for the completion of new wells and remedial work on existing wells. Well stimulation involves processes inside a well designed to enhance the flow of oil, natural gas, or other desired substances from the well. The Company also provides cementing services through its pressure pumping segment. Cementing is the process of inserting material between the wall of the well bore and the casing to support and stabilize the casing.

Directional Drilling — The Company provides a comprehensive suite of directional drilling services in most major producing onshore oil and gas basins in the United States. Substantially all of the revenue in the directional drilling segment is from directional drilling, downhole performance motors and measurement-while-drilling services, which are sold as a bundle.

Major Customer — During 2018 and 2017, no single customer accounted for more than 10% of the Company’s consolidated operating revenues. During 2016, one customer accounted for approximately $124 million or 14% of the Company’s consolidated operating revenues. These revenues in 2016 were earned in both the Company’s contract drilling and pressure pumping businesses.

The following tables summarize selected financial information relating to the Company’s business segments (in thousands):

	Year Ended December 31,
	2018			2017			2016
Revenues:
Contract drilling	$	1,432,012		$	1,041,492		$	544,196
Pressure pumping		1,573,396			1,200,311			354,070
Directional drilling		209,275			45,580			—
Other operations (1)		131,028			76,781			18,299
Elimination of intercompany revenues (2)		(18,714	)		(7,480	)		(699	)
Total revenues	$	3,326,997		$	2,356,684		$	915,866

Income (loss) before income taxes:
Contract drilling	$	(33,115	)	$	(171,897	)	$	(235,858	)
Pressure pumping		(77,328	)		21,028			(176,628	)
Directional drilling		(117,497	)		(21	)		—
Other operations		(18,221	)		(20,813	)		(3,391	)
Corporate		(93,585	)		(152,792	)		(54,672	)
Other operating income, net (3)		17,569			31,957			14,323
Interest income		5,597			1,866			327
Interest expense		(51,578	)		(37,472	)		(40,366	)
Other		750			343			69
Loss before income taxes	$	(367,408	)	$	(327,801	)	$	(496,196	)

Identifiable assets:
Contract drilling	$	3,817,638		$	3,931,994		$	3,032,819
Pressure pumping		921,237			1,209,424			653,630
Directional drilling		239,341			301,275			—
Other operations		177,374			172,094			48,885
Corporate (4)		314,276			144,069			36,957
Total assets	$	5,469,866		$	5,758,856		$	3,772,291

Depreciation, depletion, amortization and impairment:
Contract drilling	$	571,607		$	538,891		$	467,974
Pressure pumping		250,010			198,006			184,872
Directional drilling		45,317			9,347			—
Other operations		41,512			29,402			10,114
Corporate		7,872			7,695			5,474
Total depreciation, depletion, amortization and impairment	$	916,318		$	783,341		$	668,434

Capital expenditures:
Contract drilling	$	394,595		$	354,425		$	72,508
Pressure pumping		173,848			171,436			39,584
Directional drilling		35,929			7,795			—
Other operations		34,660			31,547			6,116
Corporate		2,426			1,884			1,591
Total capital expenditures	$	641,458		$	567,087		$	119,799

(1)	Other operations includes the Company’s oilfield rentals business, pipe handling components and related technology business, the electrical controls and automation business, the oil and natural gas working interests and the Middle East/North Africa activities.

(2)	In 2018 and 2017, intercompany revenues consists of contract drilling and revenues from other operations for services provided to contract drilling, pressure pumping and within other operations. In 2016, intercompany revenues consists of contract drilling and revenues within other operations.

(3)

Other operating income (expense), net includes net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments. This caption also includes expenses related to certain legal-related expenses and settlements, net of insurance reimbursements and certain research and development expenses.

(4)	Corporate assets primarily include cash on hand and certain property and equipment.