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CONCENTRATION OF RISK: (Tables)

12 Months Ended

Dec. 31, 2020

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	​	$	1,968.8		75.9	%	14.1	%	10.7	%
Switzerland	​	​	340.3	​	13.1	%	79.4	%	10.4	%
Peru	​		35.5		1.4	%	81.4	%	1.1	%
Mexico	​		249.8		9.6	%	53.8	%	5.2	%
Total cash and short-term investment	​	$	2,594.4		100.0	%	​	​	​	​

(1) 97% of the Company’s cash is in U.S. dollars.

Schedule of company's largest customers as percentage of accounts receivable and total sales

​

​	​	​	​	​	​	​	​
​		2020		2019		2018
Accounts receivable trade as of December 31,	​	​	​	​	​	​	​
Five largest customers		35.3	%	37.6	%	34.2	%
Largest customer		12.9	%	13.0	%	10.9	%
​	​	​	​	​	​	​	​
Total sales in year	​	​	​	​	​	​	​
Five largest customers		28.1	%	28.0	%	28.4	%
Largest customer		10.0	%	10.4	%	9.3	%

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Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.

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