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CONCENTRATION OF RISK: (Tables) | 12 Months Ended
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Dec. 31, 2019
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 | ​ | $ | 1,726.7 |  | 86.1 | % | 14.2 | % | 12.2 | %
Switzerland | ​ | ​ | 126.3 | ​ | 6.3 | % | 100.0 | % | 6.3 | %
Peru | ​ |  | 24.6 |  | 1.2 | % | 72.5 | % | 0.9 | %
Mexico | ​ |  | 128.2 |  | 6.4 | % | 87.0 | % | 5.6 | %
Total cash and short-term investment | ​ | $ | 2,005.8 |  | 100.0 | % | ​ | ​ | ​ | ​
| (1) | 97.4% of the Company’s cash is in U.S. dollars.
Schedule of company's largest customers as percentage of accounts receivable and total sales | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017 |
Accounts receivable trade as of December 31, | ​ | ​ | ​ | ​ | ​ | ​ | ​
Five largest customers |  | 37.6 | % | 34.2 | % | 28.4 | %
Largest customer |  | 13.0 | % | 10.9 | % | 8.2 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total sales in year | ​ | ​ | ​ | ​ | ​ | ​ | ​
Five largest customers |  | 28.0 | % | 28.4 | % | 25.1 | %
Largest customer |  | 10.4 | % | 9.3 | % | 8.8 | %

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