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Derivative Financial Instruments (Schedule Of The Effect Of Derivative Instruments On Consolidated Statements Of Income And Consolidated Statements Of Stockholders' Equity And Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	$ 766	$ 2,177	$ 1,549	$ 7,159
Carrying Amount of the Hedged Assets, Inventories	46,561		46,561
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets	3,714		3,714
Nondesignated [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivatives	14,148	(1,931)	8,086	4,957
Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	(313)	2,825	1,448	6,977
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges	(313)	2,216	1,448	6,694
Cost of Goods Sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	1,079	(648)	101	182
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges	1,736	(768)	1,719	1,173
Commodity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in Other Comprehensive Income on Derivatives	(5,422)	(5,444)	16,844	(2,834)
Commodity Contracts [Member] | Revenue [Member] | Nondesignated [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivatives	7,027	(5,215)	7,963	(10,263)
Commodity Contracts [Member] | Cost of Goods Sold [Member] | Nondesignated [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivatives	7,121	3,284	123	15,220
Commodity Contracts [Member] | Cash Flow Hedges [Member] | Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	(313)	2,825	1,448	6,977
Commodity Contracts [Member] | Cash Flow Hedges [Member] | Cost of Goods Sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	1,079	(648)	101	182
Commodity Contracts [Member] | Fair Value Hedging [Member] | Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges		(31)		1,390
Commodity Contracts [Member] | Fair Value Hedging [Member] | Revenue [Member] | Designated As Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges		(578)		(1,673)
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	1,103	(2,526)	10,496	(4,454)
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	$ (446)	$ 2,406	$ (8,878)	$ 5,445

X

- Definition

Amount of asset hedged in fair value hedging relationship.

+ References

No definition available.

+ Details

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- Definition

Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk.

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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