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Lease Obligations (Tables)
12 Months Ended
Dec. 31, 2013
Lease Obligation [Abstract]  
Minimum future lease obligations
Minimum future operating lease obligations at December 31, 2013 are as follows (U.S. dollars in thousands):

Year Ending December 31,
 
 
 
 
 
2014
 
$
31,992
 
2015
  
28,183
 
2016
  
21,157
 
2017
  
15,303
 
2018
  
12,878
 
Thereafter
  
1,440
 
Total
 
$
110,953