Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments	3
Equity Method Investment, Ownership Percentage	50.00%
Revenues	$ 3,897,247	$ 4,128,427
UNEV Pipeline [Member]
Segment Reporting Information [Line Items]
Equity Method Investment, Ownership Percentage	75.00%

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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