No definition available.

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Amount of cash deposits and noncurrent assets classified as other.

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No definition available.

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- Definition

Increase in the entity's reported revenue.

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No definition available.

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Balance Type:	credit
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- Definition

The days of the month following a transaction during which payment for accounts receivable is required to occur, as per industry practice.

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No definition available.

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The maximum percentage of U.S. domestic refiner demand supplied by the Company.

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No definition available.

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- Definition

The number of crude oil refining concerns from which the disclosed concentration of revenues is derived.

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No definition available.

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The percentage of revenues from one customer of which a loss of such a customer would not have a material adverse effect on the Company's operations.

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No definition available.

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- Definition

Deposits established for the remittance of state crude oil severance taxes and other state collateral deposits.

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No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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- Definition

Carrying amount of assets as of the balance sheet date pertaining to amounts paid by the insured (including a ceding company) under insurance or reinsurance contracts for which insurance risk is not transferred.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6387650&loc=d3e9420-108338

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- Definition

The carrying amount of capitalized costs of materials, supplies, and other assets, which are not included in inventory but used in production.

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No definition available.

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Summary of Significant Accounting Policies, Cash Deposits and Other Assets Through Concentration of Credit Risk (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Customer	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Cash Deposits and Other Assets [Abstract]
Insurance collateral deposits	$ 4,222		$ 5,032
State collateral deposits	141		143
Materials and supplies	377		354
Cash deposits and other assets	4,740		$ 5,529
Revenue Recognition [Abstract]
Revenue gross-up	$ 57,565	$ 75,927
Concentration of Credit Risk [Abstract]
Maximum percentage of US demand supplied by company	1.00%
Customer Concentration Risk [Member] \| Minimum [Member]
Concentration of Credit Risk [Abstract]
Number of customers \| Customer	3
Customer Concentration Risk [Member] \| Maximum [Member]
Concentration of Credit Risk [Abstract]
Number of customers \| Customer	5
Revenue [Member]
Concentration of Credit Risk [Abstract]
Percentage of revenues from one customer which loss would not have material effect	10.00%
Revenue [Member] \| Customer Concentration Risk [Member]
Concentration of Credit Risk [Abstract]
Concentration risk, percentage	50.00%
Accounts Receivable [Member]
Concentration of Credit Risk [Abstract]
Industry practice payment of receivables	20 days
Accounts Receivable [Member] \| Product Concentration Risk [Member]
Concentration of Credit Risk [Abstract]
Concentration risk, percentage	90.00%