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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Property Plant And Equipment Estimated Useful Life | We compute depreciation of property, plant, and equipment using the straight-line method, based on the estimated useful life of each asset as follows:
Assets |  | Lives in Years
Refining |  | 8 to 47
Logistics |  | 3 to 30
Retail |  | 14 to 18
Corporate |  | 3 to 7
Software |  | 3
Summary of Depreciation Expense | The following table summarizes depreciation expense excluded from each line item in our consolidated statements of operations (in thousands):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Cost of revenues |  | $ | 6,029 |  |  | $ | 4,604 |  |  | $ | 3,017 |
Operating expense |  | 22,861 |  |  | 16,340 |  |  | 11,428 |
General and administrative expense |  | 2,929 |  |  | 2,108 |  |  | 855 |

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