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Fair Value Measurements and Derivative Instruments Reporting (Derivative instruments location and fair value amounts) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Gross recognized liabilites $ (187) $ (194)
Gross Amounts Offset 0 0
Net Recognized Fair value Liabilities (187) (194)
Interest Rate Swap - Current [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Gross recognized liabilites (67) (86)
Gross Amounts Offset 0 0
Net Recognized Fair value Liabilities (67) (86)
Interest Rate Swap - Non-Current [Member] | Taxes Payable and Other [Member]    
Derivatives, Fair Value [Line Items]    
Gross recognized liabilites (120) (108)
Gross Amounts Offset 0 0
Net Recognized Fair value Liabilities $ (120) $ (108)