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Financial Instruments and Risk Management (Fair Value of Derivative Instruments Not Designated as Hedging Instruments) (Details) (Nondesignated [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Mar. 31, 2015
Commodity Derivative Contracts [Member] | Accounts Receivable [Member]
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 23,168us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		  
Foreign Exchange Derivative Contracts [Member] | Accounts Receivable [Member]
    
Derivatives, Fair Value [Line Items]    
Asset Derivatives   38us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Foreign Exchange Derivative Contracts [Member] | Accounts Payable [Member]
    
Derivatives, Fair Value [Line Items]    
Liability Derivatives $ (25)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_AccountsPayableMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember