Derivative Instruments And Hedging Activities (Summary Of Balance Sheet Locations And Related Fair Values Of Outstanding Derivative Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative Asset Fair Value Net Asset	$ 20,868	$ 40,280
Derivative Liability Fair Value Net Liability	4,198	2,093
Accrued Liabilities [Member]
Derivative [Line Items]
Derivative Liability Fair Value Net Liability	4,198	1,137
Other Intangible Assets [Member]
Derivative [Line Items]
Derivative Asset Fair Value Net Asset	3,253	2,298
Prepayments And Other [Member]
Derivative [Line Items]
Derivative Asset Fair Value Net Asset	17,615	37,982
Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative Liability Fair Value Net Liability	0	956
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	20,460	11,790
Derivative Asset Fair Value Gross Liability	(2,665)	(973)
Derivative Asset Fair Value Net Asset	17,795	10,817
Derivative Liability Fair Value Gross Liability	0	1,755
Derivative Liability Fair Value Gross Asset	0	(799)
Derivative Liability Fair Value Net Liability	0	956
Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	20,460	11,790
Derivative Asset Fair Value Gross Liability	(2,665)	(973)
Derivative Asset Fair Value Net Asset	17,795	10,817
Derivative Liability Fair Value Gross Liability	0	1,755
Derivative Liability Fair Value Gross Asset	0	(799)
Derivative Liability Fair Value Net Liability	0	956
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	3,073	29,463
Derivative Asset Fair Value Gross Liability	0	0
Derivative Asset Fair Value Net Asset	3,073	29,463
Derivative Liability Fair Value Gross Liability	4,198	1,137
Derivative Liability Fair Value Gross Asset	0	0
Derivative Liability Fair Value Net Liability	4,198	1,137
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	25,956
Derivative Asset Fair Value Gross Liability	0
Derivative Asset Fair Value Net Asset	0	25,956
Derivative Liability Fair Value Gross Liability	1,553
Derivative Liability Fair Value Gross Asset	0
Derivative Liability Fair Value Net Liability	1,553
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	2,617
Derivative Asset Fair Value Gross Liability	0
Derivative Asset Fair Value Net Asset	2,617
Derivative Liability Fair Value Gross Liability		1,137
Derivative Liability Fair Value Net Liability		1,137
Not Designated as Hedging Instrument [Member] \| Forward Contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	456	1,034
Derivative Asset Fair Value Gross Liability	0
Derivative Asset Fair Value Net Asset	456	$ 1,034
Not Designated as Hedging Instrument [Member] \| Nymex Futures 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
Derivative Liability Fair Value Gross Liability	2,645
Derivative Liability Fair Value Net Liability	$ 2,645

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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