Derivative Accounting - Derivative Instruments in the Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Gross Recognized Derivatives	$ 110,389	$ 4,749
Liabilities
Amount Reported on Balance Sheet	(4,373)	(18,619)
Commodity Contracts
Assets
Gross Recognized Derivatives	115,079	9,020
Amounts Offset	(4,740)	(4,271)
Net Recognized Derivatives	110,339	4,749
Other	50	0
Amount Reported on Balance Sheet	110,389	4,749
Liabilities
Gross Recognized Derivatives	(7,478)	(21,605)
Amounts Offset	4,740	4,271
Net Recognized Derivatives	(2,738)	(17,334)
Other	(1,635)	(1,285)
Amount Reported on Balance Sheet	(4,373)	(18,619)
Assets and Liabilities
Gross Recognized Derivatives	107,601	(12,585)
Amounts Offset	0	0
Net Recognized Derivatives	107,601	(12,585)
Other	(1,585)	(1,285)
Amount Reported on Balance Sheet	106,016	(13,870)
Commodity Contracts | Current Assets
Assets
Gross Recognized Derivatives	66,777	5,870
Amounts Offset	(3,346)	(2,939)
Net Recognized Derivatives	63,431	2,931
Other	50	0
Amount Reported on Balance Sheet	63,481	2,931
Commodity Contracts | Investments and Other Assets
Assets
Gross Recognized Derivatives	48,302	3,150
Amounts Offset	(1,394)	(1,332)
Net Recognized Derivatives	46,908	1,818
Other	0	0
Amount Reported on Balance Sheet	46,908	1,818
Commodity Contracts | Current Liabilities
Liabilities
Gross Recognized Derivatives	(6,084)	(9,211)
Amounts Offset	3,346	2,939
Net Recognized Derivatives	(2,738)	(6,272)
Other	(1,635)	(1,285)
Amount Reported on Balance Sheet	(4,373)	(7,557)
Commodity Contracts | Deferred Credits and Other
Liabilities
Gross Recognized Derivatives	(1,394)	(12,394)
Amounts Offset	1,394	1,332
Net Recognized Derivatives	0	(11,062)
Other	0	0
Amount Reported on Balance Sheet	$ 0	$ (11,062)