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Management fees (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Related Party Transaction [Line Items]      
Management fees $ 7,604,000 $ 8,436,000 $ 158,000
Ship Procurement Services S.A. ("SPS")      
Related Party Transaction [Line Items]      
Management fees 7,604,000 7,985,000  
Procurement services daily fee 295    
Maryville Maritime Inc.      
Related Party Transaction [Line Items]      
Management fees $ 0 $ 451,000 $ 35,000