Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Fair Value Assets and Liabilities Measured on a Recurring Basis (Details)

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Financial Instruments - Fair Value Assets and Liabilities Measured on a Recurring Basis (Details) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
LNG Inventory Derivatives | Quoted Prices in Active Markets for Identical Instruments (Level 1)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities), at fair value $ 0 $ 0
LNG Inventory Derivatives | Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities), at fair value (222) 1,951
LNG Inventory Derivatives | Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities), at fair value 0 0
LNG Inventory Derivatives | Estimated Fair Value
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities), at fair value (222) 1,951
Fuel Derivative | Quoted Prices in Active Markets for Identical Instruments (Level 1)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities), at fair value 0 0
Fuel Derivative | Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities), at fair value 60 (1,415)
Fuel Derivative | Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities), at fair value 0 0
Fuel Derivative | Estimated Fair Value
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities), at fair value 60 (1,415)
Interest Rate Derivative | Quoted Prices in Active Markets for Identical Instruments (Level 1)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities), at fair value 0 0
Interest Rate Derivative | Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities), at fair value (29,676) 0
Interest Rate Derivative | Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities), at fair value 0 0
Interest Rate Derivative | Estimated Fair Value
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities), at fair value $ (29,676) $ 0