Derivatives And Fair Value Measurements (Estimated Fair Value Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Current derivative assets	$ 66,098	$ 57,523
Noncurrent derivative assets	25,968	73,357
Current derivative liabilities	846	3,125
Noncurrent derivative liabilities	0	323
Asset Derivatives [Member]
Derivatives, Fair Value [Line Items]
Total derivative assets	142,189	165,378
Liability Derivatives [Member]
Derivatives, Fair Value [Line Items]
Total derivative liabilities	50,969	37,946
Not Designated as Hedging Instrument [Member] \| Asset Derivatives [Member]
Derivatives, Fair Value [Line Items]
Current derivative assets	66,278	60,063
Noncurrent derivative assets	75,911	105,315
Current derivative liabilities	0	0
Noncurrent derivative liabilities	0	0
Not Designated as Hedging Instrument [Member] \| Liability Derivatives [Member]
Derivatives, Fair Value [Line Items]
Current derivative assets	180	2,540
Noncurrent derivative assets	49,943	31,958
Current derivative liabilities	846	3,125
Noncurrent derivative liabilities	$ 0	$ 323

Fair value, after the 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 not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the 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, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a 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. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

- Definition

Fair value, after the effects of master netting arrangements, of a 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, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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