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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Includes the cost to prepare and move liquid hydrocarbons and natural gas to their points of sale.

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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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Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended			6 Months Ended
Segment Information (Narrative) (Details) $ in Thousands	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Segment Reporting Information [Line Items]
Results of Operations, Transportation Costs		$ 24,000	$ 24,000
Number of Reportable Segments	3
Equity Method Investment, Ownership Percentage	50.00%			50.00%
Revenues	$ 4,782,615	$ 4,471,236		$ 8,679,862	$ 8,599,663
UNEV Pipeline [Member]
Segment Reporting Information [Line Items]
Equity Method Investment, Ownership Percentage	75.00%			75.00%