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Acquisition of Filonikis Product Carrier S.A. (M/T Amor) - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
10 Months Ended 12 Months Ended
Oct. 24, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 30, 2015
Business Acquisition [Line Items]          
Equity offering 283,696       14,555,000
Price per common unit $ 3.21        
Charter Revenues   $ 204,462 $ 205,594 $ 156,613  
Filonikis Product Carrier S.A.          
Business Acquisition [Line Items]          
Acquisition related costs $ 264        
Cash consideration for acquisition of vessel $ 16,000        
Duration of above market acquired time charter 1 year        
WACC used for calculation of above market acquired time charter     7.50%    
Charter Revenues     $ 980    
Net income     $ 222    
Time charter ending October 2017 | Cargill International S.A. (Cargill) | Filonikis Product Carrier S.A.          
Business Acquisition [Line Items]          
Time Charter Years     2 years    
Charter earliest redelivery     30 days    
Time charter immediately after October 2017 | CMTC | Filonikis Product Carrier S.A.          
Business Acquisition [Line Items]          
Time Charter Years     0.17 years