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Vessels, net (Table) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property Plant And Equipment      
Balance beginning of period $ 1,007,617    
Depreciation (30,319) $ (30,395) $ (24,387)
Balance end of period 977,298 1,007,617  
Vessel Cost      
Property Plant And Equipment      
Balance beginning of period 1,167,500 1,165,645  
Other additions to vessels' cost   1,855  
Balance end of period 1,167,500 1,167,500 1,165,645
Accumulated Depreciation      
Property Plant And Equipment      
Balance beginning of period (159,883) (129,488)  
Depreciation (30,319) (30,395)  
Balance end of period (190,202) (159,883) (129,488)
Net Book Value      
Property Plant And Equipment      
Balance beginning of period 1,007,617 1,036,157  
Other additions to vessels' cost   1,855  
Depreciation (30,319) (30,395)  
Balance end of period $ 977,298 $ 1,007,617 $ 1,036,157