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Inventory Financing Agreements (Details) barrel / d in Thousands			3 Months Ended
	May 08, 2017	Jun. 01, 2015 USD ($) barrel / d	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	May 31, 2021 USD ($)	Dec. 31, 2017 USD ($)	Dec. 21, 2017	Feb. 29, 2016 USD ($) installment
Supply Commitment [Line Items]
Supply and exchange agreement expenses			$ 8,377,000	$ 8,942,000
Supply and Offtake Agreements
Supply Commitment [Line Items]
Agreement extension term	1 year
Barrels of crude per day provided (up to) | barrel / d		94
Handling fees			4,800,000	3,100,000
Supply and exchange agreement expenses			700,000	$ 800,000
Amount of deferred payment arrangement		$ 125,000,000
Percentage of receivables and inventory for deferred payment arrangement		85.00%
Deferral arrangement fee		$ 1,300,000
Variable interest rate basis		P3M
Capacity of deferred payment arrangement			73,100,000			$ 83,100,000
Outstanding amount of deferred payment arrangement			62,700,000			41,100,000
Fee agreement receivable			$ (4,700,000)			$ (7,100,000)		$ (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%
Senior Notes | 7.75% Senior Secured Note due 2025
Supply Commitment [Line Items]
Debt instrument, interest rate			7.75%				7.75%
Scenario, Forecast | Supply and Offtake Agreements
Supply Commitment [Line Items]
Fee agreement receivable					$ (2,200,000)

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