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Business Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2012
Segment Reporting [Abstract] |
Summarized Financial Information Concerning Segments | 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
Year Ended December 31, 2012 |  |  |  |  |  |  |  |  |
Revenues | $ | 2,571,544 |  |  | $ | 379,345 |  |  | $ | 116,659 |  |  | $ | 4,356 |  |  | $ | 3,071,904 |
Inter-segment revenue | (403 | ) |  | (262,712 | ) |  | (77,824 | ) |  | — |  |  | (340,939 | )
Total revenues | $ | 2,571,141 |  |  | $ | 116,633 |  |  | $ | 38,835 |  |  | $ | 4,356 |  |  | $ | 2,730,965 |
Income (loss) from operations(1) | $ | 518,144 |  |  | $ | 11,911 |  |  | $ | (73,027 | ) |  | $ | (131,832 | ) |  | $ | 325,196 |
Interest income (expense), net | 1,286 |  |  | — |  |  | (559 | ) |  | (304,076 | ) |  | (303,349 | )
Bargain purchase gain | 122,696 |  |  | — |  |  | — |  |  | — |  |  | 122,696 |
Loss on extinguishment of debt | — |  |  | — |  |  | — |  |  | (3,075 | ) |  | (3,075 | )
Other income, net | 1,868 |  |  | — |  |  | — |  |  | 2,873 |  |  | 4,741 |
Income (loss) before income taxes | $ | 643,994 |  |  | $ | 11,911 |  |  | $ | (73,586 | ) |  | $ | (436,110 | ) |  | $ | 146,209 |
Capital expenditures(2) | $ | 1,951,490 |  |  | $ | 27,527 |  |  | $ | 80,413 |  |  | $ | 114,552 |  |  | $ | 2,173,982 |
Depreciation, depletion, amortization and accretion | $ | 598,101 |  |  | $ | 34,677 |  |  | $ | 7,188 |  |  | $ | 17,864 |  |  | $ | 657,830 |
At December 31, 2012 |  |  |  |  |  |  |  |  |
Total assets | $ | 8,681,056 |  |  | $ | 199,523 |  |  | $ | 151,492 |  |  | $ | 758,660 |  |  | $ | 9,790,731 |
Year Ended December 31, 2011 |  |  |  |  |  |  |  |  |
Revenues | $ | 1,237,565 |  |  | $ | 390,485 |  |  | $ | 183,912 |  |  | $ | 10,535 |  |  | $ | 1,822,497 |
Inter-segment revenue | (265 | ) |  | (287,187 | ) |  | (118,731 | ) |  | (1,101 | ) |  | (407,284 | )
Total revenues | $ | 1,237,300 |  |  | $ | 103,298 |  |  | $ | 65,181 |  |  | $ | 9,434 |  |  | $ | 1,415,213 |
Income (loss) from operations(1) | $ | 521,117 |  |  | $ | 10,341 |  |  | $ | (12,975 | ) |  | $ | (89,470 | ) |  | $ | 429,013 |
Interest income (expense), net | 509 |  |  | (95 | ) |  | (611 | ) |  | (237,135 | ) |  | (237,332 | )
Loss on extinguishment of debt | — |  |  | — |  |  | — |  |  | (38,232 | ) |  | (38,232 | )
Other income (expense), net | 3,601 |  |  | — |  |  | (485 | ) |  | 6 |  |  | 3,122 |
Income (loss) before income taxes | $ | 525,227 |  |  | $ | 10,246 |  |  | $ | (14,071 | ) |  | $ | (364,831 | ) |  | $ | 156,571 |
Capital expenditures(2) | $ | 1,697,691 |  |  | $ | 25,674 |  |  | $ | 38,514 |  |  | $ | 54,615 |  |  | $ | 1,816,494 |
Depreciation, depletion, amortization and accretion | $ | 328,753 |  |  | $ | 32,582 |  |  | $ | 4,650 |  |  | $ | 14,259 |  |  | $ | 380,244 |
At December 31, 2011 |  |  |  |  |  |  |  |  |
Total assets | $ | 5,345,527 |  |  | $ | 219,101 |  |  | $ | 138,844 |  |  | $ | 516,137 |  |  | $ | 6,219,609 |
Year Ended December 31, 2010 |  |  |  |  |  |  |  |  |
Revenues | $ | 779,450 |  |  | $ | 265,262 |  |  | $ | 275,071 |  |  | $ | 35,285 |  |  | $ | 1,355,068 |
Inter-segment revenue | (259 | ) |  | (236,687 | ) |  | (176,549 | ) |  | (9,837 | ) |  | (423,332 | )
Total revenues | $ | 779,191 |  |  | $ | 28,575 |  |  | $ | 98,522 |  |  | $ | 25,448 |  |  | $ | 931,736 |
Income (loss) from operations(1) | $ | 88,390 |  |  | $ | (9,970 | ) |  | $ | 3,959 |  |  | $ | (89,165 | ) |  | $ | (6,786 | )
Interest income (expense), net | 496 |  |  | (920 | ) |  | (649 | ) |  | (246,369 | ) |  | (247,442 | )
Other income, net | 1,251 |  |  | — |  |  | 625 |  |  | 682 |  |  | 2,558 |
Income (loss) before income taxes | $ | 90,137 |  |  | $ | (10,890 | ) |  | $ | 3,935 |  |  | $ | (334,852 | ) |  | $ | (251,670 | )
Capital expenditures(2) | $ | 1,018,699 |  |  | $ | 31,658 |  |  | $ | 48,401 |  |  | $ | 21,661 |  |  | $ | 1,120,419 |
Depreciation, depletion, amortization and accretion | $ | 278,110 |  |  | $ | 30,031 |  |  | $ | 4,030 |  |  | $ | 13,940 |  |  | $ | 326,111 |
____________________
(1) | Exploration and production segment income from operations includes unrealized (gains) losses of $(209.7) million, $(94.8) million and $275.2 million on commodity derivative contracts for the years ended December 31, 2012, 2011 and 2010, respectively, and impairment of the Company’s goodwill of $235.4 million for the year ended December 31, 2012. For the year ended December 31, 2012, the loss from operations for the midstream services segment includes a $59.7 million impairment of the Company’s gas treating plants in west Texas and the loss from operations in the All Other column includes a $19.6 million impairment of the Company’s CO 2 compression facilities.
(2) | On an accrual basis and exclusive of acquisitions.
Major Customers | Major Customers. For the years ended December 31, 2012, 2011 and 2010, the Company had sales exceeding 10% of total revenues to the following oil and natural gas purchasers (in thousands):
| 2012
| Sales |  | % of Revenue
Occidental Petroleum Corporation | $ | 829,081 |  |  | 30.4 | %
Plains Marketing, L.P. | $ | 426,339 |  |  | 15.6 | %
Enterprise Crude Oil, LLC | $ | 394,162 |  |  | 14.4 | %
| 2011
| Sales |  | % of Revenue
Enterprise Crude Oil, LLC | $ | 319,277 |  |  | 22.6 | %
Plains Marketing, L.P. | $ | 276,285 |  |  | 19.5 | %
| 2010
| Sales |  | % of Revenue
Plains Marketing, L.P. | $ | 239,396 |  |  | 25.7 | %
Conoco Phillips Company | $ | 109,358 |  |  | 11.7 | %

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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 39 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27, 28 -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 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 + Details
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