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Intangible assets
 12 Months Ended
Dec. 31, 2017
Intangible assets [Abstract]  
Intangible assets
15
Intangible assets
 
Intangible assets at December 31, 2017 and 2016 are summarized as follows:
 
  
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
   

  
2016
 
  
Net balances
at year start
  
Additions
(Disposals)
  
Transfers
and others
  
Amortization
  
Net balances
at year end
 
Estimated
useful life
(years)
 
Software
 
$
10,610
  
$
-
  
$
3,320
  
$
5,816
  
$
8,114
 
3 and 5
 
Trademark (a)
  
125,528
   
-
   
-
   
-
   
125,528
 
Indefinite
 
  
$
136,138
  
$
-
  
$
3,320
  
$
5,816
  
$
133,642
   
 
(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, 2017 and 2016 is $10,822 and $24,188, respectively.