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Derivative Instruments And Hedging Activities Derivatives and Hedging Instruments Gains Losses due to Settlements Hedge Ineffectiveness (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Trading Activity, Gains and Losses, Net [Line Items]
Sales and other revenues	$ 4,471,236	$ 3,458,864	$ 8,599,663	$ 6,539,347
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	1,521	1,232	(4,049)	5,276
Reclassification out of Accumulated Other Comprehensive Income [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Other Cost and Expense, Operating	(5,598)	157	(4,407)	(474)
Forward Contracts [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Sales and other revenues	(5,317)	4,476	(3,671)	8,426
Commodity [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Operating Expenses	(281)	(4,421)	(736)	(8,716)
Commodity Contract [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	1,521	1,323	(4,049)	5,304
Commodity Contract [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Cost of Goods and Services Sold			0	(299)
Interest Rate Swap [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	0	(91)	0	(28)
Interest Rate Swap [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Interest Expense, Other	0	102	0	115
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] \| Commodity Contract [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Sales and other revenues	$ (5,317)	$ 4,476	$ (3,671)	$ 8,426