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Fair Value
12 Months Ended
Dec. 31, 2019
Fair Value [Abstract]  
Fair Value
10.
Fair Value

The carrying value of financial instruments including cash and cash equivalents, accounts receivable and accounts payable approximate fair values due to the short-term nature of these instruments. Fair value estimates are made at a specific point in time, based on relevant market information.

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 December 31, 2019
 
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Financial assets:
                       
Cash equivalents and current investments
 
$
54,642
   
$
   
$
   
$
54,642
 
Other long-term assets
   
3,216
     
     
     
3,216
 
Life insurance contracts
   
     
     
41,707
     
41,707
 
Total
 
$
57,858
   
$
   
$
41,707
   
$
99,565
 


 
Fair Value at December 31, 2018
 
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Financial assets:
                       
Cash equivalents and current investments
 
$
35,260
   
$
   
$
   
$
35,260
 
Other long-term assets
   
3,568
     
     
     
3,568
 
Life insurance contracts
   
     
     
35,590
     
35,590
 
Total
 
$
38,828
   
$
   
$
35,590
   
$
74,418
 

The following methods and assumptions were used to determine the fair value of each class of assets recorded at fair value in the consolidated balance sheets:

Cash equivalents and current investments: Cash equivalents and current investments primarily consist of highly rated money market funds with maturities of three months or less, and are purchased daily at par value with specified yield rates. Due to the high ratings and short-term nature of the funds, the Company considers all cash equivalents and current investments as Level 1. Current investments include $8.4 million and $11.3 million as of December 31, 2019 and 2018, respectively, that is restricted for the Company’s voluntary participation in a consumer protection cooperative in South Korea.

Life insurance contracts: ASC 820 preserves practicability exceptions to fair value measurements provided by other applicable GAAP. The guidance in ASC 715-30-35-60 allows a reporting entity, as a practical expedient, to use cash surrender value or conversion value as an expedient for fair value when it is present. Accordingly, the Company determines the fair value of its life insurance contracts as the cash-surrender value of life insurance policies held in its Rabbi Trust as disclosed in Note 13, “Executive Deferred Compensation Plan.”

The following table provides a summary of changes in fair value of the Company’s Level 3 marketable securities (U.S. dollars in thousands):

Life Insurance Contracts
 
2019
   
2018
 
Beginning balance at January 1
 
$
35,590
   
$
37,737
 
Actual return on plan assets
   
5,688
     
(1,788
)
Purchases and issuances
   
2,003
     
 
Sales and settlements
   
(1,574
)
   
(359
)
Transfers into Level 3
   
     
 
Ending balance at December 31
 
$
41,707
   
$
35,590