Derivative Instruments And Hedging Activities Derivatives and Hedging Instruments Gains Losses due to Settlements Hedge Ineffectiveness (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Trading Activity, Gains and Losses, Net [Line Items]
Cost of products sold	$ 3,752,234	[1]	$ 2,888,549	$ 10,695,275	$ 8,283,183
Sales and other revenues	4,770,799		3,719,247	13,370,462	10,258,594
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	5,792		3,291	1,742	8,567
Reclassification out of Accumulated Other Comprehensive Income [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Other Cost and Expense, Operating	(1,631)		(5,385)	(6,038)	(5,859)
Forward Contracts [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Sales and other revenues	(1,422)		(488)	(5,093)	7,937
Commodity [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Operating Expenses	(209)		(4,961)	(945)	(13,676)
Commodity Contract [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	5,792		3,354	1,742	8,658
Commodity Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Cost of products sold				0	(299)
Interest Rate Swap [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	0		(63)	0	(91)
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]
Cost of products sold				0	(299)
Sales and other revenues	$ (1,422)		$ (488)	$ (5,093)	$ 7,937

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