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Fair Value Measurements and Derivative Instruments Reporting (Derivative instruments location and fair value amounts) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Interest Rate Swap Asset [Member]    
Derivatives, Fair Value [Line Items]    
Gross recognized Assets $ 224  
Gross recognized (Liabilities)   $ 0
Gross Amounts Offset 0 0
Net Recognized Fair Value Assets 224  
Net Recognized Fair value (Liabilities)   0
Interest Rate Swap Liability [Member]    
Derivatives, Fair Value [Line Items]    
Gross recognized Assets 0  
Gross recognized (Liabilities)   (129)
Gross Amounts Offset 0 0
Net Recognized Fair Value Assets 0  
Net Recognized Fair value (Liabilities)   (129)
Interest Rate Swap - Current [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Gross recognized Assets 50  
Gross recognized (Liabilities)   0
Gross Amounts Offset 0 0
Net Recognized Fair Value Assets 50  
Net Recognized Fair value (Liabilities)   0
Interest Rate Swap - Current [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Gross recognized Assets 0  
Gross recognized (Liabilities)   (55)
Gross Amounts Offset 0 0
Net Recognized Fair Value Assets 0  
Net Recognized Fair value (Liabilities)   (55)
Interest Rate Swap - Non-Current [Member] | Deposits And Other [Member]    
Derivatives, Fair Value [Line Items]    
Gross recognized Assets 174  
Gross recognized (Liabilities)   0
Gross Amounts Offset 0 0
Net Recognized Fair Value Assets 174  
Net Recognized Fair value (Liabilities)   0
Interest Rate Swap - Non-Current [Member] | Taxes Payable and Other [Member]    
Derivatives, Fair Value [Line Items]    
Gross recognized Assets 0  
Gross recognized (Liabilities)   (74)
Gross Amounts Offset 0 0
Net Recognized Fair Value Assets $ 0  
Net Recognized Fair value (Liabilities)   $ (74)