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Fair Value of Financial Instruments and Derivatives Instruments, detail (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Derivative [Line Items]    
Derivative assets $ 88 $ 181
Derivative liabilities 17 318
Derivatives liabities - Long-term 157 360
Derivatives not designated as hedging instruments    
Derivative [Line Items]    
Total Derivatives 88 181
Total Derivatives 174 678
Derivatives not designated as hedging instruments | Interest Rare Swap | Noncurrent assets    
Derivative [Line Items]    
Derivative assets 88 181
Derivatives not designated as hedging instruments | Interest Rare Swap | Current liabilities    
Derivative [Line Items]    
Derivative liabilities 17 318
Derivatives not designated as hedging instruments | Interest Rare Swap | Noncurrent liabilities    
Derivative [Line Items]    
Derivatives liabities - Long-term $ 157 $ 360