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Commitments and Contingencies (Details) (USD $)
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1 Months Ended | |||||
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Sep. 30, 2012
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Dec. 31, 2011
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Mar. 31, 2012
Royalty Agreements [Member]
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Sep. 30, 2012
Freeport LNG Settlement Agreement [Member]
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Jun. 14, 2001
Maximum [Member]
Royalty Agreements [Member]
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Jun. 14, 2001
Minimum [Member]
Royalty Agreements [Member]
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| Oil and Gas Delivery Commitments and Contracts [Line Items] | ||||||
| Capitalized costs expensed during the period | $ 12,000,000 | |||||
| Royalty payments under settlement agreement | 11,000,000 | 2,000,000 | ||||
| Other assets | $ 35,152,000 | $ 18,895,000 | $ 25,000,000 | $ 13,200,000 | ||
| Interest Income Recognition Period | 20 years | |||||
| X | ||||||||||
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- Definition
Interest Income Recognition Period No definition available.
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| X | ||||||||||
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- Definition
Oil and Gas Delivery Commitments and Contracts, Royalty Guarantees, Amount No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Expenses recognized during the period resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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