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Fair Value Measurements (Narrative) (Details) - Weighted Average [Member] - Fair Value, Measurements, Recurring [Member] - Significant Unobservable Inputs (Level 3) [Member] | Jun. 30, 2017 | Dec. 31, 2016
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Inventory Related Payables [Member] |  |
Fair Value Measurements [Line Items] |  |
Basis | 53.90% | 67.10%
Inventories Carried At Market [Member] |  |
Fair Value Measurements [Line Items] |  |
Basis | 12.60% | 16.50%

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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 Fair Value Measurements [Line Items] + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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