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Stockholders' equity | 12 Months Ended
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Dec. 31, 2018
Disclosure of classes of share capital [abstract] |
Stockholders' equity |
16) | Stockholders’ equity
| a. | Common stock as of December 31, 2018 and 2017, is as follows:
| Number of shares (in thousands) |  | Amount
Fixed capital |  | 90,850 |  | $ | 441,786
Variable capital |  | 406,859 |  |  | 1,978,444
|  | 497,709 |  |  | 2,420,230
Effect of restatement |  |  |  |  | 412,038
Total |  | 497,709 |  | $ | 2,832,268
Common stock consists of nominative shares, fully subscribed, without nominal value. Variable capital could be increased without limitation. All shares correspond to Series “B”. This series is divided in “Class I” with 90,850,050 shares that represent the fixed capital, and “Class II” with 406,859,164 corresponding to variable capital stock.
| b. | Retained earnings include the statutory legal reserve. According to the Mexican General Corporate Law, at least 5% of net profit of the year must be transferred to the legal reserve until the reserve equals 20% of capital stock at par value (historical Mexican Pesos). The legal reserve may be capitalized but should not be distributed unless the entity is dissolved, and it must be replenished if it is reduced for any reason. As of December 31, 2018, and 2017, the legal reserve of the Company amounted to $ 484,046 (nominal pesos), representing 20% of nominal capital.
| c. | In 2018, a reserve was approved for $ 3,000,000 for the repurchase and placement of own shares, with this increase the reserve amounted to $ 5,000,000 for purchase and re-purchase operations, in order to increase the liquidity of the shares of the Company and promote stability and continuity of their prices through the Mexican Stock Exchange. As of December 31 2018, and 2017, the Company held 31,066,207 and 3,662,564 shares in treasury, respectively, which amounted to $1,903,610 and $267,553, respectively. The resulting profit in 2018 for the purchase and sale of treasury shares amounted to $ 4,239 (loss of $ 22,842 in 2017).
| d. | A reconciliation of the number of shares outstanding shows below:
| Thousands of shares
| 2 0 1 8 |  | 2 0 1 7
Shares outstanding at beginning of year |  | 494,047 |  |  | 497,586
(Repurchase) issuance of capital shares, net |  | (140) |  |  | (3,539)
Shares outstanding at year end |  | 493,907 |  |  | 494,047

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- Definition The entire disclosure for share capital, reserves and other equity interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 79 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79&doctype=Standard -URIDate 2018-03-16 + Details
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