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Prepaid and Other Current Assets (Tables) | 3 Months Ended
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Mar. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
Prepaid and Other Current Assets | Prepaid and other current assets at March 31, 2018 and December 31, 2017 consisted of the following (in thousands):
| March 31, 2018 |  | December 31, 2017
Advances to suppliers for crude oil purchases | $ | 76,410 |  |  | $ | — |
Collateral posted with broker for derivative instruments | 11 |  |  | 215 |
Prepaid insurance | 5,306 |  |  | 7,547 |
Derivative assets | 7,432 |  |  | 4,296 |
Other | 8,978 |  |  | 5,221 |
Total | $ | 98,137 |  |  | $ | 17,279 |

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- Definition Tabular disclosure of the carrying amounts of other current assets. + References No definition available. + Details
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