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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2011
Property, Plant and Equipment
(In thousands)      2011      2010    

Land

      $ 11,804       $ 11,818    

Land improvements

        51,703         51,017    

Buildings and improvements

        249,801         238,031    

Machinery and equipment

        1,660,636         1,576,932    

Office and other equipment

        6,058         5,787    

Construction in progress

        98,258         60,932    

 

  
     $ 2,078,260       $ 1,944,517    

Less accumulated depreciation

        (1,342,694 )       (1,290,061)   

 

  
     $ 735,566       $ 654,456