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
Mar. 31, 2017
Dec. 31, 2016
Commodity derivative assets    
Gross amounts on balance sheet $ 2,136,955 $ 1,914,245
Gross amounts offset on balance sheet (88,434) (110,160)
Total asset derivatives 2,048,521 1,804,085
Commodity derivative liabilities    
Gross amounts on balance sheet (113,718) (324,667)
Gross amounts offset on balance sheet 59,339 120,798
Total liability derivatives $ (54,379) $ (203,869)