Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Details 3)

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Derivative Instruments (Details 3) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Commodity derivative assets    
Gross amounts on balance sheet $ 2,885,279 $ 1,621,665
Gross amounts offset on balance sheet (42,969) (29,114)
Total asset derivatives $ 2,842,310 $ 1,592,551