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Lease and Financing Obligations (Tables)
12 Months Ended
Dec. 31, 2016
Lease and Financing Obligations [Abstract]  
Minimum Future Operating Leases and Financing Obligations
Minimum future operating leases and financing obligations at December 31, 2016 are as follows (U.S. dollars in thousands):
Year Ending December 31,
 
Operating Leases
  
Financing Obligations
 
       
2017 
 
$
36,180
  
$
631
 
2018 
  
30,001
   
650
 
2019 
  
21,310
   
670
 
2020 
  
11,602
   
690
 
2021 
  
5,997
   
698
 
Thereafter 
  
15,127
   
2,502
 
Total minimum lease payments
 
$
120,217
  
$
5,841