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Financial assets and liabilities - Short-term and long-term debt (Details) $ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2015 MXN ($)
Short-term and long-term debt |  |  |  |
Accrued interest |  | $ 6,102 | $ 5,972 |
Total financial debt |  | 1,994,283 | 3,482,714 | $ 1,591,019
Less: Short-term maturities | $ 121,789 | 1,051,237 | 2,403,562 | 1,371,202
Long-term | $ 54,681 | 943,046 | 1,079,152 | $ 219,817
Within one year |  |  |  |
Short-term and long-term debt |  |  |  |
Total financial debt |  |  | 2,403,562 |
Between one year and two years |  |  |  |
Short-term and long-term debt |  |  |  |
Total financial debt |  |  | 670,388 |
Between two and three years |  |  |  |
Short-term and long-term debt |  |  |  |
Total financial debt |  |  | 333,303 |
Between three and four years |  |  |  |
Short-term and long-term debt |  |  |  |
Total financial debt |  |  | 75,461 |
Revolving line of credit |  |  |  |
Short-term and long-term debt |  |  |  |
Financial debt excluding accrued interest |  | $ 1,271,891 | 2,528,388 |
Total financial debt |  |  | 2,531,978 |
Interest rate basis | three-month LIBOR | three-month LIBOR |  |
Revolving line of credit | Within one year |  |  |  |
Short-term and long-term debt |  |  |  |
Total financial debt |  |  | 1,452,826 |
Revolving line of credit | Between one year and two years |  |  |  |
Short-term and long-term debt |  |  |  |
Total financial debt |  |  | 670,388 |
Revolving line of credit | Between two and three years |  |  |  |
Short-term and long-term debt |  |  |  |
Total financial debt |  |  | 333,303 |
Revolving line of credit | Between three and four years |  |  |  |
Short-term and long-term debt |  |  |  |
Total financial debt |  |  | 75,461 |
Short-term working capital facility with Citibanamex |  |  |  |
Short-term and long-term debt |  |  |  |
Financial debt excluding accrued interest |  | $ 406,330 | 948,354 |
Total financial debt |  |  | 950,736 |
Interest rate basis | TIIE 28 | TIIE 28 |  |
Short-term working capital facility with Citibanamex | Within one year |  |  |  |
Short-term and long-term debt |  |  |  |
Total financial debt |  |  | $ 950,736 |
Short-term working capital facility with Bank of America |  |  |  |
Short-term and long-term debt |  |  |  |
Financial debt excluding accrued interest |  | $ 309,960 |  |
Interest rate basis |  | one-month LIBOR |  |
Spread on interest rate basis |  | 1.60% |  |
Minimum | Revolving line of credit |  |  |  |
Short-term and long-term debt |  |  |  |
Spread on interest rate basis | 1.99% | 1.99% | 1.99% |
Minimum | Short-term working capital facility with Citibanamex |  |  |  |
Short-term and long-term debt |  |  |  |
Spread on interest rate basis | 0.20% | 0.20% | 0.20% |
Maximum | Revolving line of credit |  |  |  |
Short-term and long-term debt |  |  |  |
Spread on interest rate basis | 2.25% | 2.25% | 2.25% |
Maximum | Short-term working capital facility with Citibanamex |  |  |  |
Short-term and long-term debt |  |  |  |
Spread on interest rate basis | 0.80% | 0.80% | 0.80% |

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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 + Details
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