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Transactions with related parties - Dynagas Ltd. (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2013
Related Party Transaction        
Automatic extension of Management Agreements increments 8 years      
Management services agreement initial termination date December 31, 2020      
Daily management fee $ 2,800 $ 2,700 $ 2,700 $ 2,500
Management fees annual upward percentage adjustment 3.00%      
Charter Hire Commission payable to the Management company 1.25%      
Lump sum payable to the management company for the supervision of vessels construction $ 700,000      
Cancellation of management agreement termination fee 19,100,000      
Management fee paid in advance $ 1,350,000 $ 1,350,000    
Management agreement terms The Management Agreements will terminate automatically after a change of control of the owners and/or of the owners’ ultimate parent, in which case an amount equal to the estimated remaining fees, but in any case not less than for a period of 36 months and not more than 60 months, will become payable to the Manager.      
Minimum        
Related Party Transaction        
Period for calculation of management agreement termination fee 36 months      
Maximum        
Related Party Transaction        
Period for calculation of management agreement termination fee 60 months