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Properties and Equipment, Net (Details 4) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2012 Pearsall shale | May 31, 2011 Haynesville/Bossier Shale Joint Ventures | Dec. 31, 2011 Haynesville/Bossier Shale Joint Ventures agreement | Oct. 31, 2011 Colorado, Utah and Wyoming properties | Dec. 31, 2010 Pennsylvania gathering infrastructure item mi | Nov. 30, 2010 Sale of Canadian Property Tourmaline Oil Corporation common stock | Dec. 31, 2012 Other properties | Dec. 31, 2011 Other properties | Dec. 31, 2010 Other properties | Dec. 31, 2012 Texas oil and gas properties
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of assets | $ 50,635,000 | $ 63,382,000 | $ 106,294,000 | $ 67,000,000 | $ 34,200,000 |  | $ 4,200,000 | $ 49,300,000 | $ 40,700,000 | $ 1,800,000 | $ 25,000,000 | $ 16,300,000 | $ 18,200,000
Proceeds from sale of oil and gas properties before closing adjustments |  |  |  |  |  |  | 285,000,000 |  |  |  |  |  | 29,900,000
Non-operated working interest (as a percent) |  |  |  | 35.00% |  |  |  |  |  |  |  |  |
Total consideration received from the sale of properties |  |  |  | 251,000,000 |  |  |  |  |  | 14,400,000 |  |  |
Proceeds from sale of oil and gas properties |  |  |  | 125,000,000 | 47,000,000 |  | 283,200,000 | 150,000,000 |  |  | 73,500,000 | 32,200,000 |
Accrual amount included in the gain (loss) on sale of assets |  |  |  |  |  |  |  | 17,900,000 |  |  |  |  |
Gain on sale of investment in common stock of Tourmaline |  |  |  |  |  |  |  |  | 61,300,000 |  |  |  |
Participation agreements |  |  |  |  |  | 2 |  |  |  |  |  |  |
Percentage of fund for the Company's share of future drilling and completion costs |  |  |  | 85.00% |  |  |  |  |  |  |  |  |
Future drilling and completion costs to be funded by third party |  |  |  | 126,000,000 |  |  |  |  |  |  |  |  |
Drilling and completion carry |  |  |  | 2 years |  |  |  |  |  |  |  |  |
Third party reimbursement percentage of drilling costs |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Third party percentage of working interest in leaseholds |  |  |  |  |  | 75.00% |  |  |  |  |  |  |
Reimbursement of drilling costs by third parties |  |  |  |  |  | $ 12,900,000 |  |  |  |  |  |  |
Miles of pipeline sold to Williams Field Services |  |  |  |  |  |  |  | 75 |  |  |  |  |
Number of compressor stations sold to Williams Field Services |  |  |  |  |  |  |  | 2 |  |  |  |  |

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- Definition Gain (loss) recorded from an accrual that was recognized when the company met the obligation that was determined in the terms of the purchase and sale agreement. + References No definition available. + Details
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- Definition Represents the period for of drilling and completion carry from the closing of the transaction. + References No definition available. + Details
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- Definition The difference between the sale price or salvage price and the book value of a property, plant, and equipment asset that was sold or retired during the reporting period. This element refers to the gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph c -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 -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 + Details
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