Accounting for Derivative Instruments and Hedging Activities Net Amount of Derivatives Reported in the Statement of Financial Position (Details) - Commodity Contract [Member] - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Assets:
Gross Amount Recognized in the Statement of Financial Position	$ 189,875	$ 681,650
Gross Amounts Offset in the Statement of Financial Position	0	0
Assets	189,875	681,650
Commodity Contracts	(78,345)	(125,334)
Cash Collateral Received	0	0
Net Amount	111,530	556,316
Liabilities:
Gross Amount Recognized in the Statement of Financial Position	127,110	143,342
Gross Amounts Offset in the Statement of Financial Position	0	0
Derivative Liability	127,110	143,342
Commodity Contracts	(78,345)	(125,334)
Cash Collateral Posted	(976)	(5,661)
Net Amount	$ 47,789	$ 12,347