Quarterly report pursuant to Section 13 or 15(d)

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

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Financial Instruments Financial Instruments - Derivative Gross Presentation on Consolidated Balance Sheets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Derivative, Collateral, Right to Reclaim Cash $ 5,800 $ 5,900
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
   
Derivative [Line Items]    
Derivative Asset, Fair Value, Gross Asset 71,170 98,123
Derivative Asset, Fair Value, Amount Offset Against Collateral 0 0
Derivative Asset, Fair Value, Net 71,170 98,123
Derivative, Fair Value, Gross Amount Not Offset Against Collateral, Net 0 0
Derivative, Collateral, Right to Reclaim Cash 0 0
Derivative Liability, Fair Value, Gross Liability (19,544) (13,484)
Derivative Liability, Fair Value, Amount Offset Against Collateral 0 0
Derivative Liability, Fair Value, Net (19,544) (13,484)
LNG Inventory Derivatives [Member]
   
Derivative [Line Items]    
Derivative Asset, 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
Derivative Liability, Fair Value, Gross Liability 0 (171)
Derivative Liability, Fair Value, Amount Offset Against Collateral 0 (171)
Fuel Derivatives [Member]
   
Derivative [Line Items]    
Derivative Asset, Fair Value, Gross Asset 283 126
Derivative Asset, Fair Value, Amount Offset Against Collateral 0 0
Derivative Asset, Fair Value, Net 283 126
Derivative, Fair Value, Gross Amount Not Offset Against Collateral, Net 0 0
Derivative, Collateral, Right to Reclaim Cash $ 0 $ 0