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Debt - Par Wyoming Holdings Credit Agreement (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 21, 2017 | Jul. 14, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |
Cost associated with termination of debt |  |  | $ 8,633,000 | $ 0 | $ 19,669,000
Wyoming Refining Company | Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 9.50% |  |  |
Basis spread on variable rate, paid in kind |  | 13.00% |  |  |
Secured Debt | Wyoming Refining Company |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount |  | $ 65,000,000 |  |  |
Cost associated with termination of debt | $ 5,200,000 |  |  |  |

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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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