Annual report pursuant to Section 13 and 15(d)

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

v3.19.3.a.u2
Derivative Instruments - Fair value gains (losses) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of realized and unrealized gains (losses) on derivative instruments        
Commodity derivative fair value gains (losses)   $ 463,972 $ (87,594) $ 658,283
Marketing Derivative   0 94,081 (21,394)
Proceeds from marketing derivative     73,000  
Commodity derivative fair value gains (losses) on derivatives monetized prior to settlement dates     370,000 750,000
Premium paid for a collar agreement $ 13,000      
Revenue        
Summary of realized and unrealized gains (losses) on derivative instruments        
Commodity derivative fair value gains (losses)   $ 463,972 (87,594) 658,283
Marketing Derivative     $ 94,081 $ (21,394)