Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Details 2)

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Derivative Instruments (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Net fair value of commodity derivative assets position
Dec. 31, 2013
Net fair value of commodity derivative assets position
Sep. 30, 2014
Derivatives not designated as hedges for accounting purposes
Net fair value of commodity derivative assets position
Dec. 31, 2013
Derivatives not designated as hedges for accounting purposes
Net fair value of commodity derivative assets position
Mar. 31, 2014
Derivatives designated as hedges for accounting purposes
item
Fair value of derivative instruments              
Number of derivative instruments held             0
Current portion of fair value of derivative assets $ 280,959 $ 183,000     $ 280,959 $ 183,000  
Noncurrent portion of fair value of derivative assets 458,209 677,780     458,209 677,780  
Total asset derivatives     739,168 860,780 739,168 860,780  
Current portion of fair value of derivative liability   646       646  
Noncurrent portion of fair value of derivative liability         86    
Total liability derivatives     86 646 86 646  
Net derivatives         $ 739,082 $ 860,134