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Financial Instruments (Effect Of Derivatives On Consolidated Condensed Statements Of Operations And Comprehensive Income) (Details) (Derivatives designated as hedging instruments [Member], Interest rate contracts [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]    
Net gain (loss) recognized in income $ 379us-gaap_DerivativeGainLossOnDerivativeNet $ 254us-gaap_DerivativeGainLossOnDerivativeNet
Interest expense [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Realized gain on hedging instrument $ 379us-gaap_DerivativeGainOnDerivative
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember		 [1] $ 254us-gaap_DerivativeGainOnDerivative
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember		 [1]
[1] 1) Realized gain on hedging instrument consists of net cash settlements and interest accruals on the interest rate swaps during the periods.