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CONCENTRATION OF RISK: (Tables) | 12 Months Ended
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Dec. 31, 2022
CONCENTRATION OF RISK: |
Schedule of concentration risk for cash equivalents and short- term investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ in | ​ | % of total | ​ | % in one institution |
Country |  | million |  | cash (1) |  | of country |  | of total cash |
United States | ​ | $ | 1,903.8 |  | 83.6 | % | 12.4 | % | 10.3 | %
Switzerland | ​ | ​ | 227.2 | ​ | 10.0 | % | 100.0 | % | 10.0 | %
Peru | ​ |  | 41.6 |  | 1.8 | % | 75.1 | % | 1.4 | %
Mexico | ​ |  | 105.4 |  | 4.6 | % | 56.4 | % | 2.6 | %
Total cash and short-term investment | ​ | $ | 2,278.0 |  | 100.0 | % | ​ | ​ | ​ | ​
| (1) | 96.4% of the Company’s cash is in U.S. dollars.
​
Schedule of company's largest customers as percentage of accounts receivable and total sales | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |  | 2020 |
Accounts receivable trade as of December 31, | ​ | ​ | ​ | ​ | ​ | ​ | ​
Five largest customers |  | 34.2 | % | 31.3 | % | 35.3 | %
Largest customer |  | 10.4 | % | 11.8 | % | 12.9 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total sales in year | ​ | ​ | ​ | ​ | ​ | ​ | ​
Five largest customers |  | 25.7 | % | 25.0 | % | 28.1 | %
Largest customer |  | 6.8 | % | 7.2 | % | 10.0 | %

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