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Derivative Commodity Instruments (Fair Values Of Derivative Instruments In Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Total asset derivatives	$ 3,145us-gaap_DerivativeAssets	$ 296us-gaap_DerivativeAssets
Total liability derivatives	10,108us-gaap_DerivativeLiabilities	176us-gaap_DerivativeLiabilities
Accounts Receivable, Net [Member] \| Commodity Forward Contracts [Member]
Derivative [Line Items]
Derivatives Not Designated as Hedging Instruments, Asset Derivatives	3,145	296
Accrued Liabilities [Member] \| Commodity Forward Contracts [Member]
Derivative [Line Items]
Derivatives Not Designated as Hedging Instruments, Liability Derivatives	6,549	176
Other Liabilities [Member] \| Commodity Forward Contracts [Member]
Derivative [Line Items]
Derivatives Not Designated as Hedging Instruments, Liability Derivatives	$ 3,559	$ 0

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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- 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 assets not subject to a master netting arrangement and not elected to be offset.

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