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Debt - Par Pacific Term Loan Agreement (Details) - USD ($) |  | 6 Months Ended
--- | --- | ---
Jan. 09, 2019 | Jun. 30, 2019
Debt Instrument [Line Items] |  |
Amortization of debt issuance costs |  | $ 3,700,000
Term Loan | Par Pacific Term Loan |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 45,000,000.0 |
Amortization of debt issuance costs |  | $ 100,000
Term Loan | Par Pacific Term Loan | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Margin on LIBOR rate | 3.50% |

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