Fair Value Measurements (Unobservable Inputs In Level 3 Valuations Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - Weighted Average [Member] - Significant Unobservable Inputs (Level 3) [Member] - Fair Value, Recurring [Member]	Dec. 31, 2023	Dec. 31, 2022
Assets [Member] | Inventories Component [Member]
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]
Basis	25.00%	19.40%
Transportation cost	11.50%	10.50%
Assets [Member] | Commodity Derivative Contracts [Member]
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]
Basis	24.20%	22.70%
Transportation cost	9.30%	13.50%
Liabilities [Member] | Inventories Component [Member]
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]
Basis	33.20%	15.20%
Transportation cost	0.00%	0.00%
Liabilities [Member] | Commodity Derivative Contracts [Member]
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]
Basis	24.90%	26.50%
Transportation cost	3.20%	3.70%