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Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Jul. 14, 2016
Debt Instrument [Line Items]
Principal amount of long-term debt	$ 353,457	$ 400,420
Less: unamortized discount and deferred financing costs	(23,256)	(30,024)
Total debt, net of unamortized discount and deferred financing costs	330,201	370,396
Less: current maturities	(27,140)	(20,286)
Long-term debt, net of current maturities	303,061	350,110
Hawaii Retail Credit Facilities
Debt Instrument [Line Items]
Principal amount of long-term debt	$ 85,023	95,319
5.00% Convertible Senior Notes due 2021
Debt Instrument [Line Items]
Debt instrument, interest rate	5.00%		5.00%
Term Loan
Debt Instrument [Line Items]
Principal amount of long-term debt	$ 0	60,361
J. Aron Forward Sale
Debt Instrument [Line Items]
Principal amount of long-term debt	27,855	0
Par Wyoming Holdings Term Loan
Debt Instrument [Line Items]
Principal amount of long-term debt	67,325	67,325
Wyoming Refining Senior Secured Term Loan
Debt Instrument [Line Items]
Principal amount of long-term debt	48,752	55,715
Wyoming Refining Senior Secured Revolver
Debt Instrument [Line Items]
Principal amount of long-term debt	$ 9,502	6,700
Convertible Debt \| 5.00% Convertible Senior Notes due 2021
Debt Instrument [Line Items]
Debt instrument, interest rate	5.00%
Principal amount of long-term debt	$ 115,000	$ 115,000
Less: unamortized discount and deferred financing costs	$ (20,700)