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Business Segment Information
 3 Months Ended
Mar. 31, 2014
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, related 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 providing salt water disposal services. 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 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 March 31, 2014:
 
Revenues
$
331,847

 
$
52,406

 
$
9,353

 
$
393,606

Inter-segment revenues
—

 
(36,579
)
 
(7,508
)
 
(44,087
)
Total revenues
331,847

 
15,827

 
1,845

 
349,519

Operating income
326,533

 
1,620

 
927

 
329,080

Other income (expense)
(57,660
)
 
52

 
—

 
(57,608
)
Income before income taxes
268,873

 
1,672

 
927

 
271,472

 
 
Three Months Ended March 31, 2013:
 
 
 
 
 
 
 
Revenues
$
241,652

 
$
35,768

 
$
4,820

 
$
282,240

Inter-segment revenues
—

 
(30,054
)
 
(3,882
)
 
(33,936
)
Total revenues
241,652

 
5,714

 
938

 
248,304

Operating income
114,885

 
2,563

 
505

 
117,953

Other income (expense)
(35,019
)
 
4

 
—

 
(35,015
)
Income before income taxes
79,866

 
2,567

 
505

 
82,938

 
 
Total Assets:
 
As of March 31, 2014
$
4,603,244

 
$
76,929

 
$
111,911

 
$
4,792,084

As of December 31, 2013
4,532,264

 
70,708

 
108,952

 
4,711,924