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Fair Value of Financial Instruments and Derivatives Instruments, detail 3(Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Significant Other Observable Inputs (Level 2)    
Derivative [Line Items]    
Derivative instruments- asset position $ 88 $ 181
Derivative instruments- liability position 174 678
Level 3    
Derivative [Line Items]    
Derivative instruments- asset position 0 0
Derivative instruments- liability position $ 0 $ 0