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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] | Dec. 31, 2016 | Dec. 31, 2015
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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 | 16.50% | 10.00%
Transportation cost | 8.30% | 1.80%
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 | 16.90% | 17.70%
Transportation cost | 11.60% | 6.60%
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 | 67.10% | 53.50%
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 | 27.00% | 17.90%
Transportation cost | 13.40% | 10.40%

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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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Balance Type: | na
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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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