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Intangible assets
 12 Months Ended
Dec. 31, 2018
Intangible assets [Abstract]  
Intangible assets
12
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.

The accumulated amortization of intangible assets at December 31, 2018 and 2017 is $4,236 and $10,822, respectively.