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Lease and Financing Obligations (Tables)
12 Months Ended
Dec. 31, 2017
Lease and Financing Obligations [Abstract]  
Minimum Future Operating Leases and Financing Obligations
Minimum future operating leases and financing obligations at December 31, 2017 are as follows (U.S. dollars in thousands):
Year Ending December 31,
 
Operating Leases
  
Financing Obligations
 
       
2018 
 
$
41,788
  
$
736
 
2019 
  
27,088
   
758
 
2020 
  
14,907
   
781
 
2021 
  
10,036
   
790
 
2022 
  
7,672
   
804
 
Thereafter 
  
13,250
   
2,027
 
Total minimum lease payments
 
$
114,741
  
$
5,896