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Fair Value Measurements and Derivative Instruments Reporting (Derivative Instruments Location And Fair Value Amounts) (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Gross recognized Assets (Liabilities) $ 169 $ 275
Net Recognized Fair Value Assets (Liabilities) 169 275
Interest Rate Swap - Current [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Gross recognized Assets (Liabilities) 94 77
Net Recognized Fair Value Assets (Liabilities) 94 77
Interest Rate Swap - Non-Current [Member] | Deposits And Other [Member]    
Derivatives, Fair Value [Line Items]    
Gross recognized Assets (Liabilities) 75 198
Net Recognized Fair Value Assets (Liabilities) $ 75 $ 198