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No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to inventory acquired in connection with a business combination for which the initial accounting was incomplete.

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- Definition

Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The cash outflow associated with other payments to acquire businesses including deposit on pending acquisitions and preacquisition costs.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill			$ 153,397,000				$ 107,187,000				$ 153,397,000	$ 107,187,000	$ 105,732,000
Acquisition and integration costs											10,319,000	395,000	5,294,000
Net loss			$ 13,886,000	$ (5,822,000)	$ 16,178,000	$ 15,185,000	$ 19,005,000	$ 18,824,000	$ 7,006,000	$ 27,786,000	$ 39,427,000	72,621,000	(45,835,000)
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 costs													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%
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%								5.00%		5.00%
Debt instrument, face amount		$ 115,000,000
Secured Debt \| Wyoming Refining Company
Business Acquisition [Line Items]
Wyoming Refining Senior Secured Debt	(58,036,000)
Refining \| Wyoming Refining Company
Business Acquisition [Line Items]
Goodwill	39,800,000
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