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Income tax incurred and deferred: (Details 3) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Beginning Balances | $ 1,456,020 | $ 1,523,722
Proceeds from asset tax recovery |  | 34,090
Tax charged or credited in the comprehesive income statement |  | (101,792)
Increase (decrease) in deferred tax liability (asset) |  | (67,702)
Ending Balances | 3,033,930 | 1,456,020
Provision for load portfolio impairment |  |
Beginning Balances | (33,930) | (31,576)
Proceeds from asset tax recovery |  |
Tax charged or credited in the comprehesive income statement |  | (2,354)
Increase (decrease) in deferred tax liability (asset) | (10,986) | (2,354)
Ending Balances | (44,916) | (33,930)
Concessioned assets |  |
Beginning Balances | 1,672,641 | 1,766,981
Proceeds from asset tax recovery |  |
Tax charged or credited in the comprehesive income statement |  | (94,340)
Increase (decrease) in deferred tax liability (asset) | (261,412) | (94,340)
Ending Balances | 2,858,318 | 1,672,641
Recoverable asset tax |  |
Beginning Balances | (152,785) | (186,875)
Proceeds from asset tax recovery | 152,785 | 34,090
Tax charged or credited in the comprehesive income statement |  |
Increase (decrease) in deferred tax liability (asset) | 0 | 34,090
Ending Balances | 0 | (152,785)
Other |  |
Beginning Balances | (29,906) | (24,808)
Proceeds from asset tax recovery |  |
Tax charged or credited in the comprehesive income statement |  | (5,098)
Increase (decrease) in deferred tax liability (asset) | (20,352) | (5,098)
Ending Balances | $ 177,953 | $ (29,906)

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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_ab&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_90&doctype=Standard -URIDate 2017-03-09 + Details
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