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Inventories (Tables)
12 Months Ended
Dec. 31, 2011
Inventories [Abstract]  
Inventories
                 
    December 31,  
    2011     2010  
    (Dollars in thousands)  

Raw materials

  $ 78,199     $ 63,856  

Work in process

    42,111       38,684  

Finished goods

    108,503       99,527  

Total

  $       228,813     $       202,067