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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