Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities (Schedule of Gain or Loss on Derivative Contracts) (Details)

v3.21.1
Derivative Instruments and Hedging Activities (Schedule of Gain or Loss on Derivative Contracts) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]    
(Gain) loss on derivative contracts $ (214,523) $ 251,969
Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
(Gain) loss on derivative contracts 214,523 (251,969)
Not Designated as Hedging Instrument | (Gain) loss on contingent consideration arrangements    
Derivative Instruments, Gain (Loss) [Line Items]    
(Gain) loss on derivative contracts 5,737 (1,475)
Not Designated as Hedging Instrument | September 2020 Warrants liability    
Derivative Instruments, Gain (Loss) [Line Items]    
(Gain) loss on derivative contracts (55,390) 0
Not Designated as Hedging Instrument | Commodity - Oil    
Derivative Instruments, Gain (Loss) [Line Items]    
(Gain) loss on derivative contracts 149,561 (257,323)
Not Designated as Hedging Instrument | Commodity - Natural gas    
Derivative Instruments, Gain (Loss) [Line Items]    
(Gain) loss on derivative contracts 2,697 6,829
Not Designated as Hedging Instrument | Commodity - Natural gas liquids    
Derivative Instruments, Gain (Loss) [Line Items]    
(Gain) loss on derivative contracts $ 1,138 $ 0