Derivative Accounting - Derivative Instruments in the Balance Sheets (Details) - Commodity Contracts - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets
Gross recognized derivatives	$ 2,492	$ 8,497
Amounts offset	(1,856)	(1,694)
Net Recognized Derivatives	636	6,803
Other	5	5
Amounts Reported on Balance Sheets	641	6,808
Liabilities
Gross recognized derivatives	(101,517)	(128,711)
Amounts offset	1,956	10,894
Net Recognized Derivatives	(99,561)	(117,817)
Other	(8,971)	(6,071)
Amounts Reported on Balance Sheets	(108,532)	(123,888)
Assets and Liabilities
Gross recognized derivatives	(99,025)	(120,214)
Amounts offset	100	9,200
Net Recognized Derivatives	(98,925)	(111,014)
Other	(8,966)	(6,066)
Amounts Reported on Balance Sheets	(107,891)	(117,080)
Cash collateral received subject to offsetting	100
Cash collateral received from counterparties	8,971	6,071
Current assets
Assets
Gross recognized derivatives	2,492	8,497
Amounts offset	(1,856)	(1,694)
Net Recognized Derivatives	636	6,803
Other	5	5
Amounts Reported on Balance Sheets	641	6,808
Investments and other assets
Assets
Gross recognized derivatives	0	0
Amounts offset	0	0
Net Recognized Derivatives	0	0
Other	0	0
Amounts Reported on Balance Sheets	0	0
Current liabilities
Liabilities
Gross recognized derivatives	(72,602)	(85,736)
Amounts offset	1,956	10,894
Net Recognized Derivatives	(70,646)	(74,842)
Other	(8,971)	(6,071)
Amounts Reported on Balance Sheets	(79,617)	(80,913)
Assets and Liabilities
Cash collateral received from counterparties	8,971	6,071
Deferred credits and other
Liabilities
Gross recognized derivatives	(28,915)	(42,975)
Amounts offset	0	0
Net Recognized Derivatives	(28,915)	(42,975)
Other	0	0
Amounts Reported on Balance Sheets	(28,915)	(42,975)
Assets and Liabilities
Cash collateral received from counterparties	$ 0	$ 0