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Debt - J. Aron Forward Sale (Details) - USD ($) $ in Thousands |  | 6 Months Ended | 8 Months Ended |
--- | --- | --- | --- | ---
May 08, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |
Principal amount of long-term debt |  | $ 365,086 |  |  | $ 400,420
Principal payments - 2017 |  | 218,022 | $ 17,138 |  |
Supply and Offtake Agreements |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Agreement extension term | 1 year |  |  |  |
Forward sale liability | $ 30,000 |  |  |  |
Debt instrument, interest rate | 7.00% |  |  |  |
J. Aron Forward Sale |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount of long-term debt |  | $ 29,512 |  |  | $ 0
Principal payments - 2018 | $ 7,000 |  |  |  |
Principal payments - 2019 | 7,500 |  |  |  |
Principal payments - 2020 | 8,100 |  |  |  |
Principal payments - 2021 | $ 3,500 |  |  |  |
Scenario, Forecast | J. Aron Forward Sale |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal payments - 2017 |  |  |  | $ 3,900 |

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