Derivatives (Effect Of Derivative Instruments Recognized In Statement Of Operations, Not Designated As Hedging Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Loss on derivatives	$ (64,076)	$ (22,831)
Cash payments on derivatives settled (Note 12)	(21,239)	(3,304)
Gain (loss) on derivatives [Member] | Warrant
Derivative Instruments, Gain (Loss) [Line Items]
Loss on change in fair value of warrants	(36,612)	0
Commodity derivative liabilities | Gain (loss) on derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss on derivatives	(64,076)	(22,831)
Cash payments on derivatives settled (Note 12)	(21,239)	(3,304)
Loss on derivatives less cash settlements paid on commodity derivatives	$ (42,837)	$ (19,527)