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Debt - J. Aron Forward Sale (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 21, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | May 08, 2017
Debt Instrument [Line Items] |  |  |  |  |
Cost associated with termination of debt |  | $ 8,633 | $ 0 | $ 19,669 |
Supply and Offtake Agreements |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Purchase And supply commitment, forward sale amount |  |  |  |  | $ 30,000
Debt instrument, interest rate |  |  |  |  | 7.00%
Cost associated with termination of debt | $ 300 |  |  |  |

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- Definition Purchase And Supply Commitment, Forward Sale Amount + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Details
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