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Inventory Financing Agreements (Details) barrel / d in Thousands					3 Months Ended		6 Months Ended
	Jun. 27, 2018 USD ($)	Jun. 26, 2018 USD ($)	May 08, 2017	Jun. 01, 2015 USD ($) barrel / d	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 21, 2017	Nov. 15, 2017 USD ($)	Feb. 29, 2016 USD ($) installment
Supply Commitment [Line Items]
Supply and exchange agreement expenses					$ 10,544,000	$ 9,139,000	$ 18,921,000	$ 18,081,000
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
Handling fees					6,000,000	3,300,000	10,800,000	6,400,000
Supply and exchange agreement expenses					1,300,000	$ 700,000	2,000,000	$ 1,500,000
Deferral arrangement fee				$ 1,300,000
Variable interest rate basis				P3M
Capacity of deferred payment arrangement					95,000,000		95,000,000		$ 83,100,000
Outstanding amount of deferred payment arrangement					71,400,000		71,400,000		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%

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Significant oil and gas supplies dedicated or contracted to the enterprise that can be used to fulfill existing contracts or agreements.

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