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Intangible assets
 12 Months Ended
Dec. 31, 2020
Intangible assets [Abstract]  
Intangible assets
12
Intangible assets
 
Intangible assets as of December 31, 2020 and 2019, are summarized as follows:
 
  
2020
 
  
Net
balances at
beginning
of year
  
Additions
   
Transfers
and others
  
Amortization
  
Net
balances at
year end
  
Estimated
useful life
(years)
 
Software
 
$
15,956
  
$
10,508
 
(b)
 
$
-
  
$
742
  
$
25,722
  
3 y 5
 
Trademark (a)
  
125,528
   
-
        
-
   
125,528
  
Indefinite
 
  
$
141,484
  
$
10,508
   
$
-
  
$
742
  
$
151,250
     

  
2019
 
  
Net
balances at
beginning
of year
  
Additions
  
Transfers
and others
  
Amortization
  
Net
balances at
year end
  
Estimated
useful life
(years)
 
Software
 
$
909
  
$
19,048
  
$
-
  
$
4,001
  
$
15,956
  
3 y 5
 
Trademark (a)
  
125,528
   
-
   
-
   
-
   
125,528
  
Indefinite
 
  
$
126,437
  
$
19,048
  
$
-
  
$
4,001
  
$
141,484
     
 

(a)
Corresponds to the rights on the Marmex trademark associated with the specialized maritime division segment, specifically the offshore vessels operation. This trademark is subject to annual impairment testing (see Note 13).
 

(b)
Corresponds mainly to the SAP Hana system upgrade project.
 
The accumulated amortization of intangible assets as of December 31, 2020 and 2019, is $3,850 and $7,096, respectively.