Derivatives (Effect Of Derivative Instruments Recognized In Statement Of Operations, Not Designated As Hedging Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	$ 2,609	$ (42,400)	$ (61,467)	$ (65,231)
Cash payments on derivatives settled (Note 12)			(54,123)	(9,707)
Gain (loss) on derivatives [Member] | Warrant
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on change in fair value of warrants	7,289	(3,574)	(29,323)	(3,574)
Commodity derivative liabilities | Gain (loss) on derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	2,609	(42,400)	(61,467)	(65,231)
Cash payments on derivatives settled (Note 12)	(32,884)	(6,403)	(54,123)	(9,707)
Gain (loss) on derivatives less cash settlements paid on commodity derivatives	$ 35,493	$ (35,997)	$ (7,344)	$ (55,524)