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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, Measurements, Recurring [Member] | Sep. 30, 2017 | Dec. 31, 2016
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Inventory Related Payables [Member] |  |
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Basis | 62.70% | 67.10%
Transportation cost | 0.00% | 0.00%
Commodity Derivative Contracts Losses [Member] |  |
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Basis | 21.30% | 27.00%
Transportation cost | 12.30% | 13.40%
Inventories Carried At Market [Member] |  |
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Basis | 16.20% | 16.50%
Transportation cost | 18.20% | 8.30%
Commodity Derivative Contracts Gains [Member] |  |
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Basis | 22.30% | 16.90%
Transportation cost | 12.90% | 11.60%

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- Definition Adjustment to current market value, based on location, that a market participant is willing to pay, used as an input to measure fair value. + References No definition available. + Details
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- Definition Transportation costs, used as an input to measure fair value. + References No definition available. + Details
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- Definition Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] + References No definition available. + Details
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- Details
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