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Management fees (Details) - USD ($)
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Related Party Transaction [Line Items]    
Management fees $ 3,911,000 $ 4,063,000
Ship Procurement Services S.A. ("SPS")    
Related Party Transaction [Line Items]    
Procurement services daily fee 295  
Management fees 3,911,000 3,748,000
Maryville Maritime Inc.    
Related Party Transaction [Line Items]    
Management fees $ 0 $ 315,000