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Fair Value Measurements and Derivative Instruments Reporting (Derivative instruments location and fair value amounts) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Interest Rate Swap Asset [Member]    
Derivatives, Fair Value [Line Items]    
Gross recognized Assets (Liabilities) $ 278 $ 275
Net Recognized Fair Value Assets (Liabilities) 278 275
Interest Rate Swap - Current [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Gross recognized Assets (Liabilities) 95 77
Net Recognized Fair Value Assets (Liabilities) 95 77
Interest Rate Swap - Non-Current [Member] | Deposits And Other [Member]    
Derivatives, Fair Value [Line Items]    
Gross recognized Assets (Liabilities) 183 198
Net Recognized Fair Value Assets (Liabilities) $ 183 $ 198