Significant Customers (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue, Major Customer [Line Items]
Number of significant customers	2
Concentration risk, precentage of total revenues	10.00%
Revenue for reportable segment	$ 68.9	$ 66.7	$ 57.3
Export Sales Risk	0.03
Sinclair Oil Company [Member]
Revenue, Major Customer [Line Items]
Concentration risk, precentage of total revenues	9.00%	8.00%	10.00%
Revenue for reportable segment	$ 927.0	$ 1,104.9	$ 2,018.8
Shell Oil Company [Member]
Revenue, Major Customer [Line Items]
Concentration risk, precentage of total revenues	10.00%	9.00%	11.00%
Revenue for reportable segment	$ 1,048.2	$ 1,252.6	$ 2,097.4

Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

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

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-Publisher FASB
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Description of risks that arise due to concentrations of operating facilities, revenues, assets, customers, vendors or the like in a certain geographic area, either domestic or foreign. The description may address risks inherent in the geographic area, and, at a minimum, informs users of the general nature of the risk, but excludes "Information about Geographic Areas" that may be disclosed elsewhere (for instance, segment disclosures)..

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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