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Inventory Financing Agreements (Details) barrel / d in Thousands					3 Months Ended		9 Months Ended
	Jun. 27, 2018 USD ($)	Jun. 26, 2018 USD ($)	May 08, 2017	Jun. 01, 2015 USD ($) barrel / d	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 21, 2017	Nov. 15, 2017 USD ($)	Feb. 29, 2016 USD ($) installment
Supply Commitment [Line Items]
Handling fees					$ 1,620,000	$ 1,568,000	$ 4,866,000	$ 4,510,000
Supply and exchange agreement expenses					10,425,000	7,419,000	29,346,000	25,500,000
Supply and Offtake Agreements
Supply Commitment [Line Items]
Agreement extension term			1 year
Amount of deferred payment arrangement	$ 165,000,000	$ 125,000,000
Percentage of receivables and inventory for deferred payment arrangement	85.00%	85.00%
Barrels of crude per day provided (up to) | barrel / d				94
Supply and exchange agreement expenses					1,300,000	800,000	3,300,000	2,300,000
Deferral arrangement fee				$ 1,300,000
Variable interest rate basis				P3M
Capacity of deferred payment arrangement					101,700,000		101,700,000		$ 83,100,000
Outstanding amount of deferred payment arrangement					71,800,000		71,800,000		41,100,000
Fee agreement receivable					$ (2,200,000)		$ (2,200,000)		$ (7,100,000)		$ (2,200,000)	$ (14,600,000)
Number of fee agreement payments | installment												18
Supply and Offtake Agreements | London Interbank Offered Rate (LIBOR)
Supply Commitment [Line Items]
Margin on LIBOR rate				3.75%
Deferred payment availability fee				0.75%
7.75% Senior Secured Note due 2025
Supply Commitment [Line Items]
Debt instrument, interest rate					7.75%		7.75%
Senior Notes | 7.75% Senior Secured Note due 2025
Supply Commitment [Line Items]
Debt instrument, interest rate					7.75%		7.75%			7.75%
Shipping and Handling | Supply and Offtake Agreements
Supply Commitment [Line Items]
Handling fees					$ 5,000,000	$ 3,400,000	$ 15,800,000	$ 9,800,000

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