Significant Customers (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue, Major Customer [Line Items]
Number of significant customers	2
Concentration risk, precentage of total revenues	10.00%
Revenue for reportable segment	$ 14,251,299	$ 10,535,700	$ 13,237,920
Export Sales Risk	0.07064710382
Sinclair Oil Company [Member]
Revenue, Major Customer [Line Items]
Concentration risk, precentage of total revenues	8.00%	9.00%	8.00%
Revenue for reportable segment	$ 1,135,700	$ 927,000	$ 1,104,900
Shell Oil Company [Member]
Revenue, Major Customer [Line Items]
Concentration risk, precentage of total revenues	9.00%	10.00%	9.00%
Revenue for reportable segment	$ 1,317,900	$ 1,048,200	$ 1,252,600
CANADA
Revenue, Major Customer [Line Items]
Export Sales Risk	0.03585778391

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=84177426&loc=d3e6351-108592

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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

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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.

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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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