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Fixed assets and assets held for sale - Additional Information (Details)
$ in Thousands
 2 Months Ended 7 Months Ended 8 Months Ended 12 Months Ended
Feb. 26, 2016
USD ($)
Feb. 23, 2016
USD ($)
Jul. 24, 2014
USD ($)
Aug. 31, 2014
USD ($)
Dec. 31, 2017
USD ($)
Dec. 22, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Oct. 24, 2016
USD ($)
Property Plant And Equipment                  
Number of vessels         36        
Above market acquired charters acquisition             $ 4,267    
Advances for vessels under construction - related party               $ 18,172  
Impairment of vessel         $ 3,282   0 0  
Master Agreement                  
Property Plant And Equipment                  
Number of vessels     5            
Fair value of vessels under construction acquired       $ 347,917          
Excess between the fair value of the contracted vessels and the contractual cash consideration       $ 36,417       10,251  
Contracted price     $ 311,500            
Advances for vessels under construction - related party               $ 7,921  
Master Agreement Product Carriers                  
Property Plant And Equipment                  
Number of vessels     2            
DWT     50,000            
Master Agreement Post Panamax Container Carriers                  
Property Plant And Equipment                  
Number of vessels     3            
TEU     9,100            
M/T Amor                  
Property Plant And Equipment                  
Fair value of vessels acquired                 $ 31,600
M/V CMA CGM Magdalena                  
Property Plant And Equipment                  
DWT         115,639        
Cash consideration for acquisition of vessel $ 81,500                
Amount of available cash paid for acquisition of vessel 46,500                
Fair value of vessels acquired 88,545                
Above market acquired charters acquisition             $ 3,206    
Contracted price 91,751                
M/V CMA CGM Magdalena | 2013 Credit Facility                  
Property Plant And Equipment                  
Line of credit facility amount drawn down $ 35,000 $ 35,000              
M/V Agamemnon, M/T Amore Mio II, M/T Miltiadis M II, M/T Ayrton II, M/T Axios, M/T Arionas, M/T Avax, M/T Assos, M/T Amoureux, M/T Atrotos which underwent improvements                  
Property Plant And Equipment                  
Number of vessels         10        
Vessel improvement costs capitalized         $ 967        
M/T Alkiviadis, M/V Archimidis, M/T Anemos I, M/T Amore Mio II, M/T Miltiadis M II, M/T Arionas which underwent improvements                  
Property Plant And Equipment                  
Number of vessels             6    
Vessel improvement costs capitalized             $ 1,817    
M/T Aristotelis                  
Property Plant And Equipment                  
Sale price agreed in Memorandum of Agreement           $ 29,400      
Vessel delivery, expected date           Mar. 11, 2018      
Number of vessels acquired out of the total agreed | Master Agreement                  
Property Plant And Equipment                  
Number of vessels             1 4