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Intangible assets, net (Details) $ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($)
Composition and movement of intangible assets |  |  |  |
Beginning balance |  | $ 114,041 | $ 94,649 |
Additions |  | 130,908 | 60,792 |
Disposals |  | (1,976) | (1,277) |
Amortization |  | (52,396) | (40,290) |
Exchange differences |  | (157) | 167 |
Ending balance | $ 9,649 | 190,420 | 114,041 | $ 94,649
Software |  |  |  |
Composition and movement of intangible assets |  |  |  |
Beginning balance |  | 114,041 |  |
Ending balance |  | 190,420 | 114,041 |
Amortization expense |  | 52,396 | 40,290 | $ 31,278
Software | Gross value |  |  |  |
Composition and movement of intangible assets |  |  |  |
Beginning balance |  | 313,028 |  |
Ending balance |  | 441,803 | 313,028 |
Software | Accumulated depreciation / amortization |  |  |  |
Composition and movement of intangible assets |  |  |  |
Beginning balance |  | (198,987) |  |
Ending balance |  | $ (251,383) | $ (198,987) |
Software | Minimum |  |  |  |
Composition and movement of intangible assets |  |  |  |
Estimated useful lives (in years) | 1 year | 1 year | 1 year |
Software | Maximum |  |  |  |
Composition and movement of intangible assets |  |  |  |
Estimated useful lives (in years) | 4 years | 4 years | 4 years |

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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_vi&doctype=Standard -URIDate 2017-03-09 + Details
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