Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Details 3)

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Derivative Instruments (Details 3) (Net fair value of commodity derivative assets position, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Net fair value of commodity derivative assets position
   
Commodity derivative assets    
Gross amounts on balance sheet $ 792,075 $ 887,034
Gross amounts offset on balance sheet (52,907) (26,254)
Total asset derivatives 739,168 860,780
Commodity derivative liabilities    
Gross amounts on balance sheet (2,677) (646)
Gross amounts offset on balance sheet 2,591  
Total liability derivatives $ (86) $ (646)