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Hedge Accounting (Schedule Of Derivative Instruments On The Balance Sheet At Fair Value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Derivative financial instruments - current portion $ 219 $ 218
Derivative financial instruments - non-current portion 96 212
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total derivatives designated as hedging instruments 315 430
Total derivatives 315 430
Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative financial instruments - non-current portion 96 212
Interest Rate Contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative financial instruments - current portion $ 219 $ 218