Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments - Assets and liabilities (Details)

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Derivative Instruments - Assets and liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Commodity derivative assets    
Gross amounts on balance sheet $ 2,303,100 $ 3,163,639
Gross amounts offset on balance sheet (199,273) (46,159)
Total asset derivatives 2,103,827 $ 3,117,480
Commodity derivative liabilities    
Gross amounts on balance sheet (8,308)  
Gross amounts offset on balance sheet 403  
Total liability derivatives $ (7,905)