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Accumulated other comprehensive income (Tables)
 9 Months Ended
Sep. 30, 2014
Equity [Abstract]  
Components of Changes in Accumulated Other Comprehensive Income

U.S. Dollars, in thousands)

    Foreign
Currency
Translation
Adjustments		      Market to Market
on Financial
Instruments		      Accumulated
Other
Comprehensive
Loss		  
     (Restated)      (Restated)      (Restated)  

Balance at December 31, 2013

    $ 3,651       $ (148 )     $ 3,503   

Unrealized loss on cross-currency swap and warrants, net of tax

      —          184         184   

Foreign currency translation adjustment (1)

      (2,728 )       —          (2,728 ) 
  

 

 

     

 

 

     

 

 

  

Balance at September 30, 2014

 $ 923    $ 36    $ 959   
  

 

 

     

 

 

     

 

 

  

 

(1) As undistributed earnings of non-U.S. dollar denominated foreign subsidiaries are indefinitely reinvested, no deferred taxes are recognized on the related foreign currency translation adjustment.