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Post-employment Benefits - Changes in net post-employment (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Post-employment pension plans. |  |
Beginning of year | $ 520,473 | $ 407,179
Net periodic cost | 158,905 | (53,344)
Remeasurement adjustments | 284,657 | 282,520
Benefits paid | (247,940) | (115,882)
End of year | 716,095 | 520,473
Pensions |  |
Post-employment pension plans. |  |
Beginning of year | 684,733 |
Net periodic cost | 118,553 |
Remeasurement adjustments | 84,929 | 181,161
Benefits paid | (154,921) |
End of year | 733,294 | 684,733
Seniority Premiums |  |
Post-employment pension plans. |  |
Beginning of year | (164,260) |
Net periodic cost | 40,352 |
Remeasurement adjustments | 199,728 | 101,359
Benefits paid | (93,019) |
End of year | $ (17,199) | $ (164,260)

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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_140_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_g&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from net periodic pension and seniority premium costs in the current period. + References No definition available. + Details
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