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Intangible assets (Tables)
 12 Months Ended
Dec. 31, 2019
Intangible assets [Abstract]  
Summary of Intangible Assets
Intangible assets as of December 31, 2019 and 2018, are summarized as follows:
 
  
2019
  
Net balances
at beginning of
year
  
Additions
(Disposals)
  
Transfers
and others
  
Amortization
  
Net balances
at year end
 
Estimated
useful life
(years)
Software
 
$
909
  
$
19,048
  
$
-
  
$
4,001
  
$
15,956
 
3 and 5
Trademark (a)
  
125,528
   
-
   
-
   
-
   
125,528
 
Indefinite
  
$
126,437
  
$
19,048
  
$
-
  
$
4,001
  
$
141,484
  

  
2018
  
Net balances
at beginning of
year
  
Additions
(Disposals)
  
Transfers
and others
  
Amortization
  
Net balances
at year end
 
Estimated
useful life
(years)
Software
 
$
2,362
  
$
-
  
$
-
  
$
1,453
  
$
909
 
3 and 5
Trademark (a)
  
125,528
   
-
   
-
   
-
   
125,528
 
Indefinite
  
$
127,890
  
$
-
  
$
-
  
$
1,453
  
$
126,437
  
 

(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).