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Other Liabilities
 12 Months Ended
Dec. 31, 2017
Other Liabilities [Abstract]  
Other Liabilities
9. Other Liabilities

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

  
December 31,
 
  
2016
  
2017
 
       
Deferred tax liabilities 
 
$
643
  
$
36,718
 
Reserve for other tax liabilities 
  
6,264
   
7,163
 
Liability for deferred compensation plan 
  
36,730
   
43,248
 
Pension plan benefits reserve 
  
5,631
   
6,359
 
Build to suit – financing obligation 
  
9,543
   
10,290
 
Deferred rent and deferred tenant incentives 
  
5,952
   
6,389
 
Asset retirement obligation 
  
5,682
   
6,578
 
Other 
  
6,354
   
10,371
 
  
$
76,799
  
$
127,116