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Acquisitions (Details) (USD $) |  |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2011 | Dec. 31, 2010 | Jun. 30, 2011 Appalachian Natural Gas Trust | Dec. 31, 2000 Appalachian Natural Gas Trust | May 31, 2011 Class A interest | Jun. 30, 2011 7.76% notes, due 2011 thru 2016
Acquisitions |  |  |  |  |  |
Proceeds from sale of net profits interest (NPI) in certain producing properties |  |  |  | $ 298,000,000 |  |
Ownership percentage (as a percent) |  |  |  |  | 100.00% |
Percentage of net profits received by ANGT (as a percent) |  |  |  | 100.00% |  |
Debt instrument, stated interest rate percentage (as a percent) |  |  |  |  |  | 7.76%
Aggregate principal amount |  |  |  |  |  | 57,141,000
Fair value of notes | 2,000,000,000 | 2,000,000,000 |  |  |  | 64,200,000
Gain on revaluation of existing equity investment in aquiree |  |  | 10,100,000 |  |  |
Derecognition of post revaluation of equity investment in ANGT |  |  | 48,000,000 |  |  |
Derecognition of post revaluation of oil and gas properties |  |  | 140,600,000 |  |  |
Recognition of a derivative liability for swap |  |  | 12,700,000 |  |  |
Liability for discounted sales |  |  | 16,400,000 |  |  |
Net increase in liabilities |  |  | $ 92,600,000 |  |  |

X
- Definition Represents the increase in oil and gas properties as a result of the ANPI transaction. + Details
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- Definition Represents the post-revaluation amount of equity investments prior to the derecognition as a result of the ANPI transaction. + Details
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- Definition The net increase in liabilities as a result of the ANPI transaction. + Details
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- Definition Represents the liability recognized for the discounted sales as a result of the ANPI transaction. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + Details
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- Definition Represents the percentage of net profits received from sale of natural gas and oil from natural gas producing properties. + Details
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- Definition Represents the derivative liability recognized for the swap as a result of the ANPI transaction. + Details
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- Definition Fair value of noncash consideration given by the acquirer to acquire the entity. Does not include cash paid, the fair value of debt and securities issued and liabilities incurred to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
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- Definition In a business combination achieved in stages, this element represents the amount of gain or loss recognized by the entity as a result of re measuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 48 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph q(2) + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 + Details
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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) + Details
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