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Inventories (Tables)
12 Months Ended
Dec. 31, 2013
Inventory Disclosure [Abstract]  
Schedule of Inventories
     December 31,  

(U.S. Dollars in thousands)

   2013      2012  
     (Restated)      (Restated)  

Raw materials

   $ 6,515       $ 7,623   

Work-in-process

     6,606         7,886   

Finished products

     28,291         22,236   

Field inventory

     21,312         17,061   

Consignment inventory

     2,388         4,235   

Deferred cost of sales

     7,566         10,772   
  

 

 

    

 

 

 
$ 72,678    $ 69,813