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Impairment of long-lived assets (Tables)
 12 Months Ended
Dec. 31, 2020
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.
 
  
2020
  
2019
 
  
Growth rate
  
Discount rate
  
Growth rate
  
Discount rate
 
Vessels
  
2.00
%
  
7.45
%
  
2.00
%
  
7.19
%