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Property Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2011
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
                 
    December 31,  
    2011     2010  
    (Dollars in thousands)  

Land

  $ 18,394     $ 31,120  

Buildings

    236,871       264,004  

Machinery and equipment

    677,616       666,118  

Construction in progress

    45,577       24,584  

Total property, plant and equipment

    978,458       985,826  

Total accumulated depreciation

    (599,122     (594,330

Property, plant and equipment, net

  $         379,336     $         391,496