Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Risk Management Activities (Details 3)

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Derivative Instruments and Risk Management Activities (Details 3) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair value of derivative instruments    
Current portion of fair value of derivative assets $ 204,857 $ 160,579
Noncurrent portion of fair value of derivative assets 503,666 371,436
Current portion of fair value of derivative liability 309  
Commodity contracts
   
Fair value of derivative instruments    
Net amounts of assets on balance sheet 708,214 532,015
Derivatives not designated as hedges for accounting purposes | Commodity contracts
   
Fair value of derivative instruments    
Current portion of fair value of derivative assets 204,857 160,579
Noncurrent portion of fair value of derivative assets 503,666 371,436
Net amounts of assets on balance sheet 708,523 532,015
Current portion of fair value of derivative liability $ 309