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Stockholders' equity (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of classes of share capital [abstract]  
Schedule of Common Stock
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
Schedule of Reconciliation of Number of Shares Outstanding
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