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Fair Value (Tables)
3 Months Ended
Mar. 31, 2021
Fair Value [Abstract]  
Assets Measured at Fair Value on a Recurring Basis
The following tables present the fair value hierarchy for those assets measured at fair value on a recurring basis (U.S. dollars in thousands):

 
Fair Value at March 31, 2021
 
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Financial assets (liabilities):
                       
Cash equivalents and current investments
 
$
57,236
   
$
   
$
   
$
57,236
 
Derivative financial instruments asset
   
     
5,030
     
     
5,030
 
Life insurance contracts
   
     
     
46,606
     
46,606
 
Derivative financial instruments liability
   
     
(83
)
   
     
(83
)
Contingent consideration
   
     
     
(3,264
)
   
(3,264
)
Total
 
$
57,236
   
$
4,947
   
$
43,342
   
$
105,525
 

 
Fair Value at December 31, 2020
 
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Financial assets (liabilities):
                       
Cash equivalents and current investments
 
$
56,628
   
$
   
$
   
$
56,628
 
Derivative financial instruments asset
   
     
1,145
     
     
1,145
 
Life insurance contracts
   
     
     
45,453
     
45,453
 
Derivative financial instruments liability
   
     
(105
)
   
     
(105
)
Contingent consideration
   
     
     
(3,125
)
   
(3,125
)
Total
 
$
56,628
   
$
1,040
   
$
42,328
   
$
99,996
 
Changes in Fair Value of Level 3 Marketable Securities
The following table provides a summary of changes in fair value of the Company’s Level 3 marketable securities (U.S. dollars in thousands):

Beginning balance at January 1, 2021
 
$
45,453
 
Actual return on plan assets
   
1,153
 
Purchase and issuances
   
7,016
 
Sales and settlements
   
(7,016
)
Transfers into Level 3
   
 
Ending balance at March 31, 2021
 
$
46,606
 
Changes in Fair Value of Level 3 Contingent Consideration
The following table provides a summary of changes in fair value of the Company’s Level 3 contingent consideration (U.S. dollars in thousands):

Beginning balance at January 1, 2021
 
$
(3,125
)
Changes in fair value of contingent consideration
   
(139
)
Ending balance at March 31, 2021
 
$
(3,264
)