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Stockholders' equity (Tables)
 12 Months Ended
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