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Miscellaneous Expense (Income) Net (Tables)
 12 Months Ended
Dec. 31, 2011
Miscellaneous Expense (Income), Net [Abstract]  
Components of miscellaneous expense (income), net
                         
    2011     2010     2009  
    (Dollars in thousands)  

Loss for Brazil environmental contingency

   $ —     $ 9,160     $         —  

Loss on settlement of interest rate swaps

     —       6,849       —  

Gain from Heraeus business combination

     —       (8,255 )      —  

Gain on sale of business

     —       (1,247 )      —  

Other, net

     2,492       (693 )      (618 ) 

Total miscellaneous expense (income), net

   $     2,492     $      5,814     $ (618 )