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Derivative Financial Instruments (Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income		$ 66,700	$ 5,923	$ 48,797
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges				48,797
Carrying Amount of the Hedged Assets, Inventories	$ 26,172		26,172		$ 55,021
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets	1,639		1,639		$ (2,808)
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivatives	(16,944)	15,619	19,359	(15,988)
Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income			8,824
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges			8,824
Cost of Goods Sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income			(2,901)
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges	(1,116)	(2,108)	(3,346)	1,492
Net Income (Loss) From Discontinued Operations, Net Of Income Taxes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income		66,700		48,797
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges		66,700
Commodity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss Recognized in Other Comprehensive Income on Derivatives	(3,555)	33,244	663	67,425
Commodity Contracts [Member] | Revenue [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivatives	(21,128)	12,439	8,681	(12,034)
Commodity Contracts [Member] | Cost of Goods Sold [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivatives	4,184	5,465	10,678	(1,484)
Commodity Contracts [Member] | Net Income (Loss) From Discontinued Operations, Net Of Income Taxes [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivatives		(2,285)		(2,470)
Commodity Contracts [Member] | Fair Value Hedging [Member] | Cost of Goods Sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges	4,264	1,155	(3,665)	324
Commodity Contracts [Member] | Fair Value Hedging [Member] | Cost of Goods Sold [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges	$ (5,380)	$ (3,263)	$ 3,220	$ 1,168

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Amount of asset hedged in fair value hedging relationship.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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