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Inventories (Tables)
12 Months Ended
Dec. 31, 2012
Inventories [Abstract]  
Inventories, net of reserves
                 

In thousands

    2012       2011  

Raw materials

  $ 61,084     $ 57,547  

In-process and finished

    102,331       93,096  

Supplies

    58,951       56,064  

Total

  $ 222,366     $ 206,707