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Other Assets
 12 Months Ended
Dec. 31, 2015
Other Assets [Abstract]  
Other Assets
6.            Other Assets

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

  
December 31,
 
  
2014
  
2015
 
     
Deferred taxes                                                                                                  
 
$
15,128
  
$
40,373
 
Deposits for noncancelable operating leases                                                                                                  
  
29,957
   
39,016
 
Deposit for customs assessment (Note 20)                                                                                                  
  
31,825
   
35,424
 
Cash surrender value for life insurance policies
  
26,280
   
27,292
 
Other                                                                                                  
  
24,286
   
23,354
 
  
$
127,476
  
$
165,459