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Fair Value Measurements and Derivative Instruments Reporting (Fair value and basis of valuation of financial liabilities) (Details) - Interest Rate Swap Asset [Member] - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets $ 278 $ 275
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial Liabilities $ (278) $ (275)