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Impairment of long-lived assets (Tables)
 12 Months Ended
Dec. 31, 2017
Impairment of long-lived assets [Abstract]  
Present value of expected cash flows for each segment
The present value of the cash flows expected for each segment was determined applying an appropriate discount rate.
 
  
2017
  
2016
 
  
Growth
rate
  
Discount
rate
  
Growth
rate
  
Discount
rate
 
Vessels
  
2.00
%
  
7.18
%
  
2.00
%
  
7.04
%