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Financial Instruments Financial Instruments - Derivative Instruments, Gain (Loss) (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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LNG Inventory Derivatives [Member] | Derivative gain (loss), net [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative, Gain (Loss) on Derivative, Net | $ (131,000) | $ 0 | $ (575,000) | $ 0 |
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LNG Inventory Derivatives [Member] | Marketing and trading revenues (losses) [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative, Gain (Loss) on Derivative, Net | 188,000 | 892,000 | 372,000 | 368,000 |
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Fuel Derivatives [Member] | Derivative gain (loss), net [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative, Gain (Loss) on Derivative, Net | 75,000 | (504,000) | 317,000 | 11,000 |
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Fuel Derivatives [Member] | Revenues [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative, Gain (Loss) on Derivative, Net | (167,000) | 0 | (2,000) | 0 |
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Interest Rate Contract [Member] | Derivative gain (loss), net [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative, Gain (Loss) on Derivative, Net | 9,300,000 | |||
| Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ (60,122,000) | $ 101,263,000 | $ (94,601,000) | $ 83,279,000 |