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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2015
Capital Stock [Abstract]  
Weighted Average Common Shares Outstanding
The following is a reconciliation of the weighted-average common shares outstanding for purposes of computing basic and diluted net income per share (U.S. dollars in thousands):

  
Year Ended December 31,  
 
  
2013
  
2014
  
2015
 
       
Basic weighted-average common shares outstanding
  
58,606
   
59,073
   
57,997
 
Effect of dilutive securities:    
Stock awards and options                                                                                                    
  
2,842
   
1,814
   
1,060
 
Diluted weighted-average common shares outstanding
  
61,448
   
60,887
   
59,057