Financial Instruments and Risk Management (Recognized Gains and Losses for Derivative Instruments Not Designated as Hedging Instruments) (Details) - Not Designated as Hedging Instrument - Loss on crude contracts - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Commodity derivative contracts
Derivative Instruments, Gain (Loss) [Line Items]
Loss on crude contracts	$ (46,552)	$ (226,245)	$ (202,911)	$ (440,630)
Commodity collars
Derivative Instruments, Gain (Loss) [Line Items]
Loss on crude contracts	$ (56,516)	$ 0	$ (220,934)	$ 0