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Acquisitions - Wyoming Refining Company Acquisition (Details) - USD ($)		1 Months Ended	3 Months Ended								12 Months Ended
	Jul. 14, 2016	Jun. 30, 2016	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Apr. 01, 2015
Business Acquisition [Line Items]
Adjustment to goodwill												$ (600,000)
Goodwill			$ 107,187,000				$ 105,732,000				$ 107,187,000	105,732,000	$ 41,327,000
Acquisition and integration expense											395,000	5,294,000	2,006,000
Revenues											2,443,066,000	1,865,045,000	2,066,337,000
Net loss			$ 19,005,000	$ 18,824,000	$ 7,006,000	$ 27,786,000	$ 13,687,000	$ (27,761,000)	$ (13,088,000)	$ (18,673,000)	72,621,000	(45,835,000)	$ (39,911,000)
Wyoming Refining Company
Business Acquisition [Line Items]
Payments to acquire businesses	$ 209,400,000
Adjustment to WRC environmental liability (other non-current liabilities)					2,000,000
Adjustment to inventory					500,000
Adjustment to goodwill					$ 1,500,000						$ 1,455,000
Goodwill	66,449,000
Acquisition and integration expense												700,000
Revenues												174,600,000
Net loss												$ 700,000
Other Long Term Assets | Wyoming Refining Company
Business Acquisition [Line Items]
Deposit to acquire businesses		$ 5,000,000
5% Convertible Senior Notes due 2021
Business Acquisition [Line Items]
Debt instrument, interest rate		5.00%	5.00%						5.00%		5.00%
Convertible Debt | Convertible Subordinated Bridge Notes
Business Acquisition [Line Items]
Debt instrument, interest rate			2.50%								2.50%
Convertible Debt | 5% Convertible Senior Notes due 2021
Business Acquisition [Line Items]
Debt instrument, interest rate			5.00%				0.50%				5.00%	0.50%
Debt instrument, face amount		$ 115,000,000							$ 115,000,000
Secured Debt | Wyoming Refining Company
Business Acquisition [Line Items]
Wyoming Refining Senior Secured Debt	(58,036,000)
Refining
Business Acquisition [Line Items]
Goodwill														$ 13,500,000
Refining | Wyoming Refining Company
Business Acquisition [Line Items]
Goodwill	39,800,000
Logistics
Business Acquisition [Line Items]
Goodwill														$ 10,800,000
Logistics | Wyoming Refining Company
Business Acquisition [Line Items]
Goodwill	26,600,000
Revolving Credit Facility | Wyoming Refining Senior Secured Revolver | Wyoming Refining Company
Business Acquisition [Line Items]
Wyoming Refining Senior Secured Debt	(10,100,000)
Secured Debt | Wyoming Refining Company
Business Acquisition [Line Items]
Debt instrument, face amount	$ 65,000,000

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