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Debt - Wyoming Refining Credit Facilities (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Term Loan | Wyoming Refining Senior Secured Term Loan  
Debt Instrument [Line Items]  
Periodic payment, principal $ 2.3
Revolving Credit Facility | Wyoming Refining Senior Secured Revolver  
Debt Instrument [Line Items]  
Line credit maximum borrowing amount $ 30.0