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

The Company has three business segments: exploration and production, drilling and oil field services and midstream services. These segments represent the Company’s three main business units, each offering different products and services. The exploration and production segment is engaged in the acquisition, development and production of oil and natural gas properties and includes the activities of the Royalty Trusts. The drilling and oil field services segment is engaged in the contract drilling of oil and natural gas wells and provides various oil field services. The midstream services segment is engaged in the purchasing, gathering, treating and selling of natural gas and the distribution of electricity to the Company’s exploration and production operations in the Mississippian formation. The All Other column in the tables below includes items not related to the Company’s reportable segments, including the Company’s CO2 gathering and sales as well as its corporate operations.

    
Management evaluates the performance of the Company’s business segments based on income (loss) from operations, which is defined as segment operating revenues less operating expenses and depreciation, depletion, amortization, accretion and impairment. Summarized financial information concerning the Company’s segments is shown in the following table (in thousands):
 
Exploration and Production
 
Drilling and Oil Field Services
 
Midstream Services
 
All Other
 
Consolidated Total
Three Months Ended June 30, 2013
 
 
 
 
 
 
 
 
 
Revenues
$
458,374

 
$
47,100

 
$
64,291

 
$
778

 
$
570,543

Inter-segment revenue
(81
)
 
(31,011
)
 
(26,464
)
 
—

 
(57,556
)
Total revenues
$
458,293

 
$
16,089

 
$
37,827

 
$
778

 
$
512,987

 
 
 
 
 
 
 
 
 
 
Income (loss) from operations(1)
$
241,666

 
$
(19,443
)
 
$
(7,956
)
 
$
(127,809
)
 
$
86,458

Interest income (expense)
317

 
—

 
(84
)
 
(61,392
)
 
(61,159
)
Other (expense) income, net
(330
)
 
—

 
135

 
89

 
(106
)
Income (loss) before income taxes
$
241,653

 
$
(19,443
)
 
$
(7,905
)
 
$
(189,112
)
 
$
25,193

Capital expenditures(2)
$
358,582

 
$
883

 
$
15,111

 
$
12,582

 
$
387,158

Depreciation, depletion, amortization, accretion and impairment
$
148,884

 
$
19,478

 
$
4,017

 
$
7,989

 
$
180,368

Three Months Ended June 30, 2012
 
 
 
 
 
 
 
 
 
Revenues
$
434,834

 
$
104,076

 
$
24,798

 
$
1,543

 
$
565,251

Inter-segment revenue
(77
)
 
(70,444
)
 
(16,296
)
 
—

 
(86,817
)
Total revenues
$
434,757

 
$
33,632

 
$
8,502

 
$
1,543

 
$
478,434

 
 
 
 
 
 
 
 
 
 
Income (loss) from operations(1)
$
786,335

 
$
4,678

 
$
(3,631
)
 
$
(24,969
)
 
$
762,413

Interest income (expense)
416

 
—

 
(137
)
 
(68,848
)
 
(68,569
)
Bargain purchase gain
122,696

 
—

 
—

 
—

 
122,696

Other income (expense), net
242

 
—

 
—

 
(323
)
 
(81
)
Income (loss) before income taxes
$
909,689

 
$
4,678

 
$
(3,768
)
 
$
(94,140
)
 
$
816,459

Capital expenditures(2)
$
518,343

 
$
5,836

 
$
17,754

 
$
20,121

 
$
562,054

Depreciation, depletion, amortization and accretion
$
147,479

 
$
8,624

 
$
1,717

 
$
4,753

 
$
162,573

 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30, 2013
 
 
 
 
 
 
 
 
 
Revenues
$
939,784

 
$
96,837

 
$
101,125

 
$
1,631

 
$
1,139,377

Inter-segment revenue
(162
)
 
(63,378
)
 
(51,160
)
 
—

 
(114,700
)
Total revenues
$
939,622

 
$
33,459

 
$
49,965

 
$
1,631

 
$
1,024,677

 
 
 
 
 
 
 
 
 
 
Loss from operations(3)
$
(60,042
)
 
$
(28,408
)
 
$
(10,415
)
 
$
(174,203
)
 
$
(273,068
)
Interest income (expense)
635

 
—

 
(209
)
 
(147,495
)
 
(147,069
)
Loss on extinguishment of debt
—

 
—

 
—

 
(82,005
)
 
(82,005
)
Other income (expense), net
298

 
—

 
(664
)
 
871

 
505

Loss before income taxes
$
(59,109
)
 
$
(28,408
)
 
$
(11,288
)
 
$
(402,832
)
 
$
(501,637
)
Capital expenditures(2)
$
716,173

 
$
1,515

 
$
30,332

 
$
27,850

 
$
775,870

Depreciation, depletion, amortization, accretion and impairment
$
316,397

 
$
28,292

 
$
5,705

 
$
12,615

 
$
363,009

At June 30, 2013
 
 
 
 
 
 
 
 
 
Total assets
$
5,923,355

 
$
172,329

 
$
171,461

 
$
1,486,491

 
$
7,753,636

 
 
 
 
 
 
 
 
 
 
 
Exploration and Production
 
Drilling and Oil Field Services
 
Midstream Services
 
All Other
 
Consolidated Total
Six Months Ended June 30, 2012
 
 
 
 
 
 
 
 
 
Revenues
$
777,955

 
$
202,408

 
$
50,960

 
$
2,959

 
$
1,034,282

Inter-segment revenue
(155
)
 
(139,467
)
 
(34,591
)
 
—

 
(174,213
)
Total revenues
$
777,800

 
$
62,941

 
$
16,369

 
$
2,959

 
$
860,069

 
 
 
 
 
 
 
 
 
 
Income (loss) from operations(3)
$
662,499

 
$
8,157

 
$
(6,358
)
 
$
(53,541
)
 
$
610,757

Interest income (expense)
559

 
—

 
(293
)
 
(135,800
)
 
(135,534
)
Bargain purchase gain
122,696

 
—

 
—

 
—

 
122,696

Other income, net
2,010

 
—

 
—

 
377

 
2,387

Income (loss) before income taxes
$
787,764

 
$
8,157

 
$
(6,651
)
 
$
(188,964
)
 
$
600,306

Capital expenditures(2)
$
1,010,248

 
$
13,752

 
$
41,729

 
$
65,983

 
$
1,131,712

Depreciation, depletion, amortization and accretion
$
237,531

 
$
17,174

 
$
3,128

 
$
8,925

 
$
266,758

At December 31, 2012
 
 
 
 
 
 
 
 
 
Total assets
$
8,681,056

 
$
199,523

 
$
151,492

 
$
758,660

 
$
9,790,731

____________________
(1)
Exploration and production segment income from operations includes unrealized gains of $85.9 million and $580.7 million on commodity derivative contracts for the three-month periods ended June 30, 2013 and 2012, respectively.
(2)
On an accrual basis.
(3)
Exploration and production segment (loss) income from operations includes unrealized gains of $61.1 million and $451.5 million on commodity derivative contracts for the six-month periods ended June 30, 2013 and 2012, respectively. Exploration and production segment also includes a loss on the sale of the Permian Properties of $399.1 million for the six-month period ended June 30, 2013.