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Inventories (Tables)
9 Months Ended
Sep. 30, 2013
Inventory Disclosure [Abstract]  
Summary of Inventories
     September 30,     December 31,  
(dollars in thousands)    2013     2012  

Raw materials

   $ 19,979      $ 2,508   

Work in process

     4,106        —    

Finished goods

     2,918        1,817   

Obsolescence allowance

     (744     (427
  

 

 

   

 

 

 
   $ 26,259      $ 3,898