Business Segment Information

The Company’s exploration and production segment is engaged in the acquisition and development of oil and natural gas properties. Revenues for the exploration and production segment are derived from the sale of oil and natural gas production. The Company’s midstream services business segment (OMS) performs produced and flowback water gathering and disposal services, fresh water services, natural gas gathering and processing and crude oil gathering and transportation and other midstream services for the Company’s oil and natural gas wells operated by OPNA and other third-party operators. Revenues for the midstream segment are primarily derived from produced and flowback water pipeline transport, produced and flowback water disposal, fresh water sales, natural gas gathering and processing and crude oil gathering, blending, stabilization and transportation. The Company’s well services business segment (OWS) performs completion services for the Company’s oil and natural gas wells operated by OPNA. Revenues for the well services segment are derived from providing well services, product sales and equipment rentals. The revenues and expenses related to work performed by OMS and OWS for OPNA’s working interests are eliminated in consolidation, and only the revenues and expenses related to non-affiliated working interest owners are included in the Company’s Condensed Consolidated Statements of Operations. These segments represent the Company’s three operating units, each offering different products and services. The Company’s corporate activities have been allocated to the supported business segments accordingly.

Management evaluates the performance of the Company’s business segments based on operating income, which is defined as segment operating revenues less operating expenses, including DD&A. The following table summarizes financial information for the Company’s three business segments for the periods presented:



	Exploration and Production			Midstream Services			Well Services			Eliminations			Consolidated
	(In thousands)
Three months ended March 31, 2018:
Revenues from non-affiliates	$	381,708		$	27,922		$	11,586		$	—		$	421,216
Inter-segment revenues	—			36,640			33,302			(69,942		)	—
Total revenues	381,708			64,562			44,888			(69,942		)	421,216
Operating income	79,962			32,237			8,148			(7,362		)	112,985
Other expense	(108,146		)	(258		)	(41		)	—			(108,445		)
Income (loss) before income taxes including non-controlling interests	$	(28,184	)	$	31,979		$	8,107		$	(7,362	)	$	4,540

Three months ended March 31, 2017:
Revenues from non-affiliates	$	264,883		$	14,606		$	5,627		$	—		$	285,116
Inter-segment revenues	—			23,035			15,352			(38,387		)	—
Total revenues	264,883			37,641			20,979			(38,387		)	285,116
Operating income (loss)	968			20,763			(3,592		)	1,953			20,092
Other income (expense)	19,768			(2		)	4			—			19,770
Income (loss) before income taxes	$	20,736		$	20,761		$	(3,588	)	$	1,953		$	39,862

At March 31, 2018:
Property, plant and equipment, net	$	6,600,397		$	732,801		$	47,310		$	(193,902	)	$	7,186,606
Total assets⁽¹⁾	6,994,927			752,301			50,605			(158,903		)	7,638,930
At December 31, 2017:
Property, plant and equipment, net	$	5,663,323		$	649,923		$	46,779		$	(186,539	)	$	6,173,486
Total assets⁽¹⁾	6,050,255			663,614			52,800			(151,539		)	6,615,130

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(1)	Intercompany receivables (payables) for all segments were reclassified to capital contributions from (distributions to) parent and not included in total assets.