Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Derivative Gross Presentation on Consolidated Balance Sheets (Details)

v2.4.0.8
Financial Instruments - Derivative Gross Presentation on Consolidated Balance Sheets (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fuel Derivatives [Member]
    
Derivative [Line Items]    
Derivative Liability, Fair Value, Gross Liability $ (200) $ (98)
Derivative Liability, Fair Value, Amount Offset Against Collateral (200) (98)
Derivative Liability, Fair Value, Net 0 0
Derivative, Fair Value, Gross Amount Not Offset Against Collateral, Net 0 0
Derivative, Collateral, Right to Reclaim Cash 0 0
LNG Inventory Derivatives [Member]
    
Derivative [Line Items]    
Derivative Asset, Fair Value, Gross Asset 764 232
Derivative Asset, Fair Value, Amount Offset Against Collateral 556 0
Derivative Asset, Fair Value, Net 208 232
Derivative, Fair Value, Gross Amount Not Offset Against Collateral, Net 0 0
Derivative, Collateral, Right to Reclaim Cash 0 0
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
    
Derivative [Line Items]    
Derivative Liability, Fair Value, Gross Liability (3,555) (5,134)
Derivative Liability, Fair Value, Amount Offset Against Collateral 0 0
Derivative Liability, Fair Value, Net (3,555) (5,134)
Derivative Asset, Fair Value, Gross Asset 81,762  
Derivative Asset, Fair Value, Amount Offset Against Collateral 0  
Derivative Asset, Fair Value, Net 81,762  
Derivative, Fair Value, Gross Amount Not Offset Against Collateral, Net 0 0
Derivative, Collateral, Right to Reclaim Cash 0 0
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
    
Derivative [Line Items]    
Derivative Liability, Fair Value, Gross Liability   (21,290)
Derivative Liability, Fair Value, Amount Offset Against Collateral   0
Derivative Liability, Fair Value, Net   (21,290)
Derivative, Fair Value, Gross Amount Not Offset Against Collateral, Net   0
Derivative, Collateral, Right to Reclaim Cash   0
Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
    
Derivative [Line Items]    
Derivative Liability, Fair Value, Net 78,207  
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivative [Line Items]    
Derivative Liability, Fair Value, Net   $ (26,424)