Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments - Fair value gains (losses) (Details)

v3.19.2
Derivative Instruments - Fair value gains (losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Summary of realized and unrealized gains (losses) on derivative instruments        
Commodity derivative fair value gains (losses) $ 328,427 $ 55,336 $ 251,059 $ 77,773
Marketing derivative fair value gains   (110)   94,124
Revenue        
Summary of realized and unrealized gains (losses) on derivative instruments        
Commodity derivative fair value gains (losses) $ 328,427 55,336 $ 251,059 77,773
Marketing derivative fair value gains   (110)   $ 94,124
Maximum        
Summary of realized and unrealized gains (losses) on derivative instruments        
Marketing derivative fair value gains   $ 1,000