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Other Assets
 12 Months Ended
Dec. 31, 2017
Other Assets [Abstract]  
Other Assets
7. Other Assets

Other assets consist of the following (U.S. dollars in thousands):

  
December 31,
 
  
2016
  
2017
 
       
Deferred taxes 
 
$
35,752
  
$
33,785
 
Deposits for noncancelable operating leases 
  
38,858
   
43,375
 
Cash surrender value for life insurance policies
  
32,286
   
37,737
 
Other 
  
29,573
   
49,998
 
  
$
136,469
  
$
164,895