Derivative Instruments And Hedging Activities (Summary Of Balance Sheet Locations And Related Fair Values Of Outstanding Derivative Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative Asset Fair Value Net Asset	$ 24,947	$ 40,280
Derivative Liability Fair Value Net Liability	2,478	2,093
Accrued Liabilities [Member]
Derivative [Line Items]
Derivative Liability Fair Value Net Liability	1,922	1,137
Other Intangible Assets [Member]
Derivative [Line Items]
Derivative Asset Fair Value Net Asset	1,652	2,298
Prepayments And Other [Member]
Derivative [Line Items]
Derivative Asset Fair Value Net Asset	23,295	37,982
Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative Liability Fair Value Net Liability	556	956
Forward Contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	0
Derivative Asset Fair Value Gross Liability	0
Derivative Asset Fair Value Net Asset	0
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	13,182	11,790
Derivative Asset Fair Value Gross Liability	(1,576)	(973)
Derivative Asset Fair Value Net Asset	11,606	10,817
Derivative Liability Fair Value Gross Liability	1,872	1,755
Derivative Liability Fair Value Gross Asset	(500)	(799)
Derivative Liability Fair Value Net Liability	1,372	956
Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	13,182	11,790
Derivative Asset Fair Value Gross Liability	(1,576)	(973)
Derivative Asset Fair Value Net Asset	11,606	10,817
Derivative Liability Fair Value Gross Liability	1,614	1,755
Derivative Liability Fair Value Gross Asset	(500)	(799)
Derivative Liability Fair Value Net Liability	1,114	956
Designated as Hedging Instrument [Member] \| Forward Contracts [Member]
Derivative [Line Items]
Derivative Liability Fair Value Gross Liability	258
Derivative Liability Fair Value Gross Asset	0
Derivative Liability Fair Value Net Liability	258
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	13,341	29,463
Derivative Asset Fair Value Gross Liability	0	0
Derivative Asset Fair Value Net Asset	13,341	29,463
Derivative Liability Fair Value Gross Liability	1,126	1,137
Derivative Liability Fair Value Gross Asset	(20)	0
Derivative Liability Fair Value Net Liability	1,106	1,137
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	2,511	25,956
Derivative Asset Fair Value Gross Liability	0
Derivative Asset Fair Value Net Asset	2,511	25,956
Derivative Liability Fair Value Gross Liability	17
Derivative Liability Fair Value Gross Asset	0
Derivative Liability Fair Value Net Liability	17
Not Designated as Hedging Instrument [Member] \| NYMEX WTI Short [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		2,473
Derivative Asset Fair Value Gross Liability		0
Derivative Asset Fair Value Net Asset		2,473
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	6,401
Derivative Asset Fair Value Gross Liability	0
Derivative Asset Fair Value Net Asset	6,401
Derivative Liability Fair Value Gross Liability	0	1,137
Derivative Liability Fair Value Gross Asset	(20)
Derivative Liability Fair Value Net Liability	(20)	1,137
Not Designated as Hedging Instrument [Member] \| Forward Contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,453	1,034
Derivative Asset Fair Value Gross Liability	0
Derivative Asset Fair Value Net Asset	1,453	$ 1,034
Derivative Liability Fair Value Gross Liability	1,109
Derivative Liability Fair Value Gross Asset	0
Derivative Liability Fair Value Net Liability	1,109
Not Designated as Hedging Instrument [Member] \| Nymex Futures Contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	2,976
Derivative Asset Fair Value Gross Liability	0
Derivative Asset Fair Value Net Asset	$ 2,976

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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