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
	Mar. 31, 2022	Mar. 31, 2021
Commodity derivative contracts
Derivative Instruments, Gain (Loss) [Line Items]
Loss on crude contracts	$ (156,359)	$ (214,385)
Commodity collars
Derivative Instruments, Gain (Loss) [Line Items]
Loss on crude contracts	$ (164,418)	$ 0