Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments - Fair value gains (Details)

v3.7.0.1
Derivative Instruments - Fair value gains (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Summary of realized and unrealized gains (losses) on derivative instruments    
Commodity derivative fair value gains (losses) $ 438,775 $ 279,924
Revenue    
Summary of realized and unrealized gains (losses) on derivative instruments    
Commodity derivative fair value gains (losses) $ 438,775 $ 279,924