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Business Segment Information
 6 Months Ended
Jun. 30, 2013
Segment Reporting [Abstract]  
Business Segment Information
Business Segment Information

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 and related product sales. 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 providing salt water disposal services. Prior to 2013, the salt water disposal systems were owned by OPNA, and the related income was included as a reduction to lease operating expenses. 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. Prior to 2012, the Company only operated its exploration and production segment. The 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. 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 expenses. Summarized financial information for the Company’s segments is shown in the following table:
 
 
Exploration and
Production
 
Well Services
 
Midstream Services
 
Consolidated
 
(In thousands)
Three Months Ended June 30, 2013:
 
Revenues
$
241,842

 
$
31,382

 
$
7,035

 
$
280,259

Inter-segment revenues
—

 
(19,921
)
 
(5,756
)
 
(25,677
)
Total revenues
241,842

 
11,461

 
1,279

 
254,582

Operating income
105,459

 
3,310

 
4,681

 
113,450

Other income (expense)
(8,511
)
 
4

 
—

 
(8,507
)
Income before income taxes
96,948

 
3,314

 
4,681

 
104,943

Three Months Ended June 30, 2012:
 
 
 
 
 
 
 
Revenues
$
145,203

 
$
16,505

 
$
—

 
$
161,708

Inter-segment revenues
—

 
(12,644
)
 
—

 
(12,644
)
Total revenues
145,203

 
3,861

 
—

 
149,064

Operating income
58,735

 
1,450

 
—

 
60,185

Other income (expense)
61,297

 
—

 
—

 
61,297

Income before income taxes
120,032

 
1,450

 
—

 
121,482

Six Months Ended June 30, 2013:
 
Revenues
$
483,493

 
$
67,150

 
$
11,855

 
$
562,498

Inter-segment revenues
—

 
(49,975
)
 
(9,637
)
 
(59,612
)
Total revenues
483,493

 
17,175

 
2,218

 
502,886

Operating income
218,357

 
5,873

 
7,173

 
231,403

Other income (expense)
(43,530
)
 
8

 
—

 
(43,522
)
Income before income taxes
174,827

 
5,881

 
7,173

 
187,881

Six Months Ended June 30, 2012:
 
 
 
 
 
 
 
Revenues
$
283,109

 
$
17,749

 
$
—

 
$
300,858

Inter-segment revenues
—

 
(13,228
)
 
—

 
(13,228
)
Total revenues
283,109

 
4,521

 
—

 
287,630

Operating income
100,978

 
17,357

 
—

 
118,335

Other income (expense)
29,410

 
—

 
—

 
29,410

Income before income taxes
130,388

 
17,357

 
—

 
147,745

Total Assets:
 
As of June 30, 2013
$
2,617,366

 
$
52,209

 
$
88,569

 
$
2,758,144

As of December 31, 2012
2,475,820

 
52,974

 
—

 
2,528,794