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Marketable Securities (Tables)
6 Months Ended
Jun. 30, 2022
Marketable Securities [Abstract]  
Schedule of marketable securities by significant investing categories
   June 30, 2022 
   Amortized
cost
   Gross
unrealized
gain
   Gross
unrealized
loss
   Fair value 
                 
Matures within one year:                
Corporate debentures  $17,878   $7   $(98)  $17,787 
Government debentures   3,997    -    (58)   3,939 
    21,875    7    (156)   21,726 
                     
Matures after one year through three years:                    
Corporate debentures   227,505    9    (12,842)   214,672 
Government debentures   12,078    -    (577)   11,501 
    239,583    9    (13,419)   226,173 
                     
Total  $261,458   $16   $(13,575)  $247,899 

 

   December 31, 2021 
  

Amortized

Cost

   Gross
unrealized
gain
   Gross
unrealized
loss
   Fair value 
                 
Matures within one year:                
Corporate debentures  $25,430   $170   $-   $25,600 
Government debentures   2,507    9    
-
    2,516 
    27,937    179    -    28,116 
                     
Matures after one year through three years:                    
Corporate debentures   140,364    435    (1,090)   139,709 
Government debentures   9,648    11    (99)   9,560 
    150,364    446    (1,189)   149,269 
                     
Total  $177,949   $625   $(1,189)  $177,385 

 

Schedule of investments with continuous unrealized losses for less than 12 months and 12 months or greater and their related fair values
   June 30, 2022 
   Less than 12 months   12 months or greater   Total 
   Fair value   Unrealized
losses
   Fair value   Unrealized
losses
   Fair value   Unrealized
losses
 
                         
Corporate debentures  $207,128   $(11,398)  $20,775   $(1,542)  $227,903   $(12,940)
Government debentures   7,298    (245)   8,142    (390)   15,440    (635)
                               
Total  $214,426   $(11,643)  $28,917   $(1,932)  $243,343   $(13,575)