Derivative Instruments and Hedging Activities (Summary Of Balance Sheet Locations And Related Fair Values Of Outstanding Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	$ 9,484	$ 3,773
Derivative Liability, Fair Value, Net Liability	32,580	61,947
Prepayments and other
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	9,484	3,469
Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net Liability	32,580	36,976
Other Intangible Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net		304
Other Long Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net Liability		24,971
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	91	304
Derivative Asset, Fair Value, Gross Liability	0	0
Derivative, Fair Value, Net	91	304
Derivative Liability, Fair Value, Gross Liability	16,163	38,869
Derivative Liability, Fair Value, Gross Asset	(431)	0
Derivative Liability, Fair Value, Net Liability	15,732	38,869
Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	13,185	38,755
Derivative Liability, Fair Value, Gross Asset	(431)	0
Derivative Liability, Fair Value, Net Liability	12,754	38,755
Designated as Hedging Instrument [Member] \| Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	2,978
Derivative Liability, Fair Value, Gross Asset	0
Derivative Liability, Fair Value, Net Liability	2,978
Designated as Hedging Instrument [Member] \| Interest rate swap
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	91	304
Derivative Asset, Fair Value, Gross Liability	0	0
Derivative, Fair Value, Net	91	304
Derivative Liability, Fair Value, Gross Liability		114
Derivative Liability, Fair Value, Gross Asset		0
Derivative Liability, Fair Value, Net Liability		114
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	10,149	3,469
Derivative Asset, Fair Value, Gross Liability	(756)	0
Derivative, Fair Value, Net	9,393	3,469
Derivative Liability, Fair Value, Gross Liability	26,735	60,196
Derivative Liability, Fair Value, Gross Asset	(9,887)	(37,118)
Derivative Liability, Fair Value, Net Liability	16,848	23,078
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	4,244
Derivative Asset, Fair Value, Gross Liability	(756)
Derivative, Fair Value, Net	3,488
Derivative Liability, Fair Value, Gross Liability	12,903	60,196
Derivative Liability, Fair Value, Gross Asset	(9,887)	(37,118)
Derivative Liability, Fair Value, Net Liability	3,016	23,078
Not Designated as Hedging Instrument [Member] \| Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	5,905
Derivative Asset, Fair Value, Gross Liability	0
Derivative, Fair Value, Net	5,905
Derivative Liability, Fair Value, Gross Liability	5,338
Derivative Liability, Fair Value, Gross Asset	0
Derivative Liability, Fair Value, Net Liability	5,338
Not Designated as Hedging Instrument [Member] \| Nymex Futures Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		3,469
Derivative Asset, Fair Value, Gross Liability		0
Derivative, Fair Value, Net		$ 3,469
Derivative Liability, Fair Value, Gross Liability	1,975
Derivative Liability, Fair Value, Gross Asset	0
Derivative Liability, Fair Value, Net Liability	1,975
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	6,519
Derivative Liability, Fair Value, Gross Asset	0
Derivative Liability, Fair Value, Net Liability	$ 6,519

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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Fair value, before effects of master netting arrangements, of a 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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Fair value of asset associated with financial liability or 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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The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

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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.

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