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Retrospective restatement of the 2016 and 2017 financial statements (Schedule of Statements of Cash Flows) (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement Line Items [Line Items] |  |  |
Net income of the year | $ 3,446,930 | $ 1,894,631 | $ 4,364,740
Adjustments: |  |  |
Interest income from investing activities | (312,821) | (252,290) | (140,033)
Income tax | 752,462 | 1,122,809 | 936,394
(increase) Related parties receivable | 17,465 | (41,311) | (172,322)
Net cash flows provided by operating activities | 3,223,884 | 3,184,355 | 5,705,754
Investing activities: |  |  |
loans granted to related parties | (477,064) | (412,443) | (2,277,256)
Net cash flows (used) provided by investing activities | (820,153) | (3,118,362) | (5,442,895)
Financing activities: |  |  |
Loans granted to related parties | (984,623) | (41,027) | (40,170)
Net cash flows (used)/provided by financing activities | $ (2,641,430) | (374,294) | 898,085
Previously presented [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Net income of the year |  | 1,721,527 | 4,343,211
Adjustments: |  |  |
Interest income from investing activities |  | (54,238) | (108,151)
Income tax |  | 1,097,860 | 926,041
(increase) Related parties receivable |  | (453,754) | (55,863)
Net cash flows provided by operating activities |  | 2,771,912 | 5,822,213
Investing activities: |  |  |
Net cash flows (used) provided by investing activities |  | 2,705,919 | (3,165,639)
Financing activities: |  |  |
Loans granted to related parties |  |  | 2,393,715
Net cash flows (used)/provided by financing activities |  |  | (1,495,630)
Modified [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Net income of the year |  | 1,894,631 | 4,364,740
Adjustments: |  |  |
Interest income from investing activities |  | (252,291) | (140,033)
Income tax |  | 1,122,809 | 936,394
(increase) Related parties receivable |  | (41,311) | (172,322)
Net cash flows provided by operating activities |  | 3,184,355 | 5,705,754
Investing activities: |  |  |
loans granted to related parties |  | (412,443) | (2,277,256)
Net cash flows (used) provided by investing activities |  | $ 3,118,362 | (5,442,895)
Financing activities: |  |  |
Net cash flows (used)/provided by financing activities |  |  | $ 898,085

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