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Fair Value Measurements (Narrative) (Detail) - $ / gal | Sep. 30, 2018 | Dec. 31, 2017
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Fair Value [Abstract] |  |
Minimum range of DOE index curve used in DCF model | 3.36 | 2.95
Maximum range of DOE index curve used in DCF model | 3.39 | 3.00
Weighted average DOE index curve used in DCF model | 3.38 | 2.96

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