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Debt - Par Pacific Term Loan Agreement (Details) - Term Loan - Par Pacific Term Loan - USD ($) |  | 3 Months Ended
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Jan. 09, 2019 | Mar. 31, 2019
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 45,000,000.0 |
Amortization of debt issuance costs |  | $ 100,000
London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Margin on LIBOR rate | 3.50% |

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