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Business Segment Information
 3 Months Ended
Mar. 31, 2015
Segment Reporting [Abstract]  
Business Segment Information
Business Segment Information
The Company’s exploration and production segment is engaged in the acquisition and development of oil and natural gas properties and includes the complementary marketing services provided by OPM. Revenues for the exploration and production segment are primarily derived from the sale of oil and natural gas production. In the first quarter of 2012, the Company began its well services business segment (OWS) to perform 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 completion services, well completion product sales and tool rentals. In the first quarter of 2013, the Company formed its midstream services business segment (OMS) to perform salt water disposal and other midstream services for the Company’s oil and natural gas wells operated by OPNA. Revenues for the midstream segment are primarily derived from salt water transport, salt water disposal and fresh water sales. The revenues and expenses related to work performed by OWS and OMS 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 Statement of Operations. These segments represent the Company’s three current 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 depreciation, depletion and amortization. The following table summarizes financial information for the Company’s business segments for the periods presented:
 
 
Exploration and
Production
 
Well Services
 
Midstream Services
 
Eliminations
 
Consolidated
 
(In thousands)
Three months ended March 31, 2015:
 
Revenues from external customers
$
173,859

 
$
2,708

 
$
3,820

 
$
—

 
$
180,387

Inter-segment revenues
—

 
48,197

 
13,822

 
(62,019
)
 
—

Total revenues
173,859

 
50,905

 
17,642

 
(62,019
)
 
180,387

Operating income (loss)
(42,247
)
 
9,610

 
9,308

 
(10,306
)
 
(33,635
)
Other income (expense)
8,239

 
(2
)
 
(19
)
 
—

 
8,218

Income (loss) before income taxes
$
(34,008
)
 
$
9,608

 
$
9,289

 
$
(10,306
)
 
$
(25,417
)
 
 
Three months ended March 31, 2014:
 
 
 
 
 
 
 
 
 
Revenues from external customers
$
331,847

 
$
15,827

 
$
1,845

 
$
—

 
$
349,519

Inter-segment revenues
—

 
36,579

 
7,508

 
(44,087
)
 
—

Total revenues
331,847

 
52,406

 
9,353

 
(44,087
)
 
349,519

Operating income
322,945

 
13,452

 
4,632

 
(11,949
)
 
329,080

Other income (expense)
(57,660
)
 
52

 
—

 
—

 
(57,608
)
Income before income taxes
$
265,285

 
$
13,504

 
$
4,632

 
$
(11,949
)
 
$
271,472

 
 
As of March 31, 2015:
 
Property, plant and equipment, net
$
5,194,649

 
$
56,270

 
$
207,713

 
$
(129,270
)
 
$
5,329,362

Total assets
5,758,513

 
330,239

 
265,627

 
(437,442
)
 
5,916,937

As of December 31, 2014:
 
 
 
 
 
 
 
 
 
Property, plant and equipment, net
$
5,074,588

 
$
58,767

 
$
172,394

 
$
(118,963
)
 
$
5,186,786

Total assets
5,802,295

 
281,844

 
212,685

 
(358,412
)
 
5,938,412