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Significant Accounting Policies (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Significant Accounting Policies [Abstract]    
Maximum original maturity of highly-liquid investments, in order to be classified as cash and cash equivalents 3  
Write off of doubtful accounts $ 0 $ 22
Scrap value per light weight ton (LWT) $0.2  
Vessels useful life 25 years  
Minimum    
Interval between vessel drydocking 30  
Maximum    
Interval between vessel drydocking 60