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Financial Instruments and Concentration of Risk (Fair Values of Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Assets $ 421us-gaap_DerivativeFairValueOfDerivativeAsset $ 1,830us-gaap_DerivativeFairValueOfDerivativeAsset
Derivatives designated as hedging instruments [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Assets 793us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 1,830us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Other non-current assets [Member] | Derivatives designated as hedging instruments [Member] | Interest rate contracts [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Assets $ 793us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 $ 1,830us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember