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FAIR VALUE (Tables)
6 Months Ended
Jun. 30, 2018
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 June 30, 2018
 
  
Level 1
  
Level 2
  
Level 3
  
Total
 
             
Financial assets (liabilities):
            
Cash equivalents and current investments
 
$
79,249
  
$
  
$
  
$
79,249
 
Other long-term assets 
  
3,566
   
   
   
3,566
 
Forward contracts 
  
   
   
   
 
Life insurance contracts 
  
   
   
38,232
   
38,232
 
Total 
 
$
82,815
  
$
  
$
38,232
  
$
121,047
 


  
Fair Value at December 31, 2017
 
  
Level 1
  
Level 2
  
Level 3
  
Total
 
             
Financial assets (liabilities):
            
Cash equivalents and current investments
 
$
36,531
  
$
  
$
  
$
36,531
 
Other long-term assets 
  
3,726
   
   
   
3,726
 
Forward contracts 
  
   
158
   
   
158
 
Life insurance contracts 
  
   
   
37,737
   
37,737
 
Total 
 
$
40,257
  
$
158
  
$
37,737
  
$
78,152
 
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
   
    
Beginning balance at April 1, 2018
 
$
38,929
 
Actual return on plan assets:
    
Relating to assets still held at the reporting date 
  
(633
)
Purchases and issuances 
  
 
Sales and settlements 
  
(64
)
Transfers into Level 3 
  
 
Ending balance at June 30, 2018
 
$
38,232