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Financial Instruments (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||||||||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Fair Value of LNG inventory derivatives | $ 28,000 | [1] | $ 28,000 | [1] | ||||||
| Fair value of Fuel Derivatives | 664,000 | [2] | 664,000 | [2] | ||||||
| Marketing and trading revenues | 1,000,000 | 200,000 | 900,000 | 500,000 | ||||||
| Derivative gain (loss) | 261,000 | (448,000) | (575,000) | (448,000) | ||||||
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Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Fair Value of LNG inventory derivatives | 0 | [1] | 0 | [1] | ||||||
| Fair value of Fuel Derivatives | 0 | [2] | 0 | [2] | ||||||
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Significant Other Observable Inputs (Level 2) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Fair Value of LNG inventory derivatives | 28,000 | [1] | 28,000 | [1] | ||||||
| Fair value of Fuel Derivatives | 664,000 | [2] | 664,000 | [2] | ||||||
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Significant Unobservable Inputs (Level 3) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||
| Fair Value of LNG inventory derivatives | 0 | [1] | 0 | [1] | ||||||
| Fair value of Fuel Derivatives | $ 0 | [2] | $ 0 | [2] | ||||||
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