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Impairment of long-lived assets (Tables)
 12 Months Ended
Dec. 31, 2018
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.

  
2018
  
2017
 
  
Growth
rate
  
Discount
rate
  
Growth
rate
  
Discount
rate
 
Vessels
  
2.00
%
  
7.18
%
  
2.00
%
  
7.18
%