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Stockholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of classes of share capital [abstract] |
Schedule of Common Stock |
|  | Common stock as of December 31, 2019 and 2018, 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
Schedule of Reconciliation of Number of Shares Outstanding |
|  | A reconciliation of the number of shares outstanding shows below:
| Thousands of shares
| 2 0 1 9 |  | 2 0 1 8
Shares outstanding at beginning of year |  | 466,643 |  |  | 494,047
Repurchase of capital shares, net |  | (2,664) |  |  | (27,044)
Shares outstanding at year end |  | 463,979 |  |  | 466,643

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