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Fair Value (Tables)
12 Months Ended
Dec. 31, 2016
Fair Value [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following tables present the fair value hierarchy for those assets and liabilities measured at fair value on a recurring basis (U.S. dollars in thousands):

  
Fair Value at December 31, 2015
 
  
Level 1
  
Level 2
  
Level 3
  
Total
 
             
Financial assets (liabilities):
            
Cash equivalents and current investments 
 
$
47,121
  
$
 ─  
$
 ─  
$
47,121
 
Forward contracts 
 
   
485
  
   
485
 
Life insurance contracts 
 
  
   
27,292
   
27,292
 
Total 
 
$
47,121
  
$
485
  
$
27,292
  
$
74,898
 
 
  
Fair Value at December 31, 2016
 
  
Level 1
  
Level 2
  
Level 3
  
Total
 
             
Financial assets (liabilities):
            
Cash equivalents and current investments 
 
$
50,307
  
$
 ─  
$
 ─  
$
50,307
 
Other long term assets 
  
2,782
  
  
   
2,782
 
Forward contracts 
 
   
1,371
  
   
1,371
 
Life insurance contracts 
 
  
   
32,286
   
32,286
 
Total 
 
$
53,089
  
$
1,371
  
$
32,286
  
$
86,746
 
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):

Life Insurance Contracts
 
2015
  
2016
 
       
Beginning balance at January 1
 
$
26,280
  
$
27,292
 
Actual return on plan assets:
        
Relating to assets still held at the reporting date
  
(1,597
)
  
2,196
 
Purchases and issuances 
  
3,025
   
3,051
 
Sales and settlements 
  
(416
)
  
(252
)
Transfers into Level 3 
 
  
 
Ending balance at December 31
 
$
27,292
  
$
32,287