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Summary of significant accounting policies (Tables)
 12 Months Ended
Dec. 31, 2013
Accounting Policies [Abstract]  
Schedule of Useful Lives

The useful lives are as follows:

 

     Years  

Buildings

      25 to 33   

Plant equipment and instrumentation

      2 to 10   

Furniture and fixtures

      4 to 8   
Components of Changes in Accumulated Other Comprehensive Income

The components of and changes in accumulated other comprehensive income are as follows:

 

(U.S. Dollars in thousands)

    Foreign Currency
Translation
Adjustments		      Change in
Fair Value		      Accumulated Other
Comprehensive
Income		  

Balance at December 31, 2011 (Restated)

    $ 4,228       $ (132 )     $ 4,096   

Unrealized gain on cross-currency swaps, net of taxes of $153

      —           263         263   

Foreign currency translation adjustment (1)

      1,131         —           1,131   
  

 

 

     

 

 

     

 

 

  

Balance at December 31, 2012 (Restated)

   5,359      131      5,490   

Unrealized loss on cross-currency swaps, net of tax benefit of $164

   —        (278 )    (278 ) 

Unrealized gain (loss) on warrants

   —        (1 )    (1 ) 

Foreign currency translation adjustment (1)

   (1,708 )    —        (1,708 ) 
  

 

 

     

 

 

     

 

 

  

Balance at December 31, 2013 (Restated)

 $ 3,651    $ (148 )  $ 3,503   
  

 

 

     

 

 

     

 

 

  

 

(1) As the cash generally remains permanently invested in the non U.S. dollar denominated foreign subsidiaries, no deferred taxes are recognized on the related foreign currency translation adjustment.