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CONCENTRATION OF RISK: (Tables)
12 Months Ended
Dec. 31, 2021
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

$

2,690.3

 

77.1

%  

13.6

%  

10.5

%

Switzerland

598.7

17.2

%  

56.9

%  

9.8

%

Peru

 

29.1

 

0.8

%  

43.0

%  

0.4

%

Mexico

 

170.8

 

4.9

%  

82.4

%  

4.0

%

Total cash and short-term investment

$

3,488.9

 

100.0

%  

(1)97.8% of the Company’s cash is in U.S. dollars.
Schedule of company's largest customers as percentage of accounts receivable and total sales

    

2021

    

2020

    

2019

 

Accounts receivable trade as of December 31, 

Five largest customers

 

31.3

%  

35.3

%  

37.6

%

Largest customer

 

11.8

%  

12.9

%  

13.0

%

Total sales in year

Five largest customers

 

25.0

%  

28.1

%  

28.0

%

Largest customer

 

7.2

%  

10.0

%  

10.4

%