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Intangible assets (Tables)
 12 Months Ended
Dec. 31, 2018
Intangible assets [Abstract]  
Summary of Intangible Assets
Intangible assets at December 31, 2018 and 2017 are summarized as follows:

  
2018
  
Net balances
at year start
  
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
  

  
2017
  
Net balances
at year start
  
Additions
(Disposals)
  
Transfers
and others
  
Amortization
  
Net balances
at year end
 
Estimated
useful life
(years)
Software
 
$
8,114
  
$
-
  
$
(4,079
)
 
$
1,673
  
$
2,362
 
3 and 5
Trademark (a)
  
125,528
   
-
   
-
   
-
   
125,528
 
Indefinite
  
$
133,642
  
$
-
  
$
(4,079
)
 
$
1,673
  
$
127,890
  


(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.