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Business Segment Information
 6 Months Ended
Jun. 30, 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 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 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 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 three business segments for the periods presented: 
 
Exploration and
Production
 
Well Services
 
Midstream Services
 
Eliminations
 
Consolidated
 
(In thousands)
Three months ended June 30, 2016:
 
Revenues from non-affiliates
$
159,337

 
$
12,834

 
$
6,909

 
$
—

 
$
179,080

Inter-segment revenues
—

 
8,301

 
22,026

 
(30,327
)
 
—

Total revenues
159,337

 
21,135

 
28,935

 
(30,327
)
 
179,080

Operating income (loss)
(44,748
)
 
(2,173
)
 
18,056

 
651

 
(28,214
)
Other income (expense)
(114,230
)
 
31

 
(16
)
 
—

 
(114,215
)
Income (loss) before income taxes
$
(158,978
)
 
$
(2,142
)
 
$
18,040

 
$
651

 
$
(142,429
)
 
 
Three months ended June 30, 2015:
 
 
 
 
 
 
 
 
 
Revenues from non-affiliates
$
214,110

 
$
9,219

 
$
6,717

 
$
—

 
$
230,046

Inter-segment revenues
—

 
49,469

 
21,944

 
(71,413
)
 
—

Total revenues
214,110

 
58,688

 
28,661

 
(71,413
)
 
230,046

Operating income (loss)
(22,529
)
 
9,008

 
15,947

 
(9,863
)
 
(7,437
)
Other income (expense)
(76,635
)
 
22

 
(25
)
 
—

 
(76,638
)
Income (loss) before income taxes
$
(99,164
)
 
$
9,030

 
$
15,922

 
$
(9,863
)
 
$
(84,075
)
 
 
 
 
 
 
 
 
 
 
Six months ended June 30, 2016:
 
 
 
 
 
 
 
 
 
Revenues from non-affiliates
$
276,652

 
$
18,818

 
$
13,893

 
$
—

 
$
309,363

Inter-segment revenues
—

 
33,205

 
44,860

 
(78,065
)
 
—

Total revenues
276,652

 
52,023

 
58,753

 
(78,065
)
 
309,363

Operating income (loss)
(133,625
)
 
1,848

 
33,200

 
(4,852
)
 
(103,429
)
Other income (expense)
(131,119
)
 
37

 
(2
)
 
—

 
(131,084
)
Income (loss) before income taxes
$
(264,744
)
 
$
1,885

 
$
33,198

 
$
(4,852
)
 
$
(234,513
)
 
 
Six months ended June 30, 2015:
 
 
 
 
 
 
 
 
 
Revenues from non-affiliates
$
387,969

 
$
11,927

 
$
10,537

 
$
—

 
$
410,433

Inter-segment revenues
—

 
97,666

 
35,766

 
(133,432
)
 
—

Total revenues
387,969

 
109,593

 
46,303

 
(133,432
)
 
410,433

Operating income (loss)
(64,776
)
 
18,618

 
25,255

 
(20,169
)
 
(41,072
)
Other income (expense)
(68,396
)
 
20

 
(44
)
 
—

 
(68,420
)
Income (loss) before income taxes
$
(133,172
)
 
$
18,638

 
$
25,211

 
$
(20,169
)
 
$
(109,492
)
 
 
At June 30, 2016:
 
Property, plant and equipment, net
$
4,951,972

 
$
53,926

 
$
351,116

 
$
(170,280
)
 
$
5,186,734

Total assets(1)
5,191,725

 
57,482

 
356,612

 
(170,280
)
 
5,435,539

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

 
$
61,402

 
$
264,956

 
$
(165,427
)
 
$
5,218,242

Total assets(1)(2)
5,478,439

 
66,952

 
269,411

 
(165,427
)
 
5,649,375

___________________
(1)
Intercompany receivables (payables) for all segments were reclassified to capital contributions from (distributions to) parent and not included in total assets.
(2)
At December 31, 2015, total assets included assets held for sale of $26.7 million in the exploration and production segment related to the assets sold as of April 1, 2016 (see Note 7 – Divestiture).