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Business Segment Information
 3 Months Ended
Mar. 31, 2016
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. Revenues for the exploration and production segment are derived from the sale of oil and natural gas production. 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 completion services and tool rentals. The Company’s midstream services business segment (OMS) performs salt water gathering and 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 pipeline 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, 2016:
 
Revenues from non-affiliates
$
117,315

 
$
5,985

 
$
6,983

 
$
—

 
$
130,283

Inter-segment revenues
—

 
24,903

 
22,835

 
(47,738
)
 
—

Total revenues
117,315

 
30,888

 
29,818

 
(47,738
)
 
130,283

Operating income (loss)
(88,877
)
 
4,006

 
15,144

 
(5,488
)
 
(75,215
)
Other income (expense)
(16,887
)
 
5

 
13

 
—

 
(16,869
)
Income (loss) before income taxes
$
(105,764
)
 
$
4,011

 
$
15,157

 
$
(5,488
)
 
$
(92,084
)
 
 
Three months ended March 31, 2015:
 
 
 
 
 
 
 
 
 
Revenues from non-affiliates
$
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
)
 
 
 
 
 
 
 
 
 
 
As of March 31, 2016:
 
Property, plant and equipment, net
$
4,994,366

 
$
57,821

 
$
295,913

 
$
(170,931
)
 
$
5,177,169

Total assets(1)
5,367,881

 
62,076

 
301,242

 
(170,931
)
 
5,560,268

As of December 31, 2015:
 
 
 
 
 
 
 
 
 
Property, plant and equipment, net
$
5,057,311

 
$
61,402

 
$
264,956

 
$
(165,427
)
 
$
5,218,242

Total assets(1)
5,478,439

 
66,952

 
269,411

 
(165,427
)
 
5,649,375

___________________
(1)
As of March 31, 2016, total assets included assets held for sale of $25.8 million in the exploration and production segment and $34,000 in the midstream services segment. As of December 31, 2015, total assets included assets held for sale of $26.7 million in the exploration and production segment (see Note 7 – Assets Held for Sale). For the periods presented, the intercompany receivables (payables) for all segments were reclassified to capital contributions from (distributions to) parent and not included in total assets.