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Business Segment Information | 6 Months Ended
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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 CO 2 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 |
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(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.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599 + Details
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