Financial Instruments and Risk Management (Recognized Gains and Losses for Derivative Instruments Not Designated as Hedging Instruments) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Commodity derivative contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on derivative instruments	$ 50,089	$ (43,235)	$ (152,822)	$ (483,865)
Commodity collars
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on derivative instruments	$ 65,102	$ (15,929)	$ (155,832)	$ (15,929)