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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2011
Summary Of Significant Accounting Policies [Abstract]  
Components Of Inventories
     December 31,  
     2011     2010  
     (In thousands)  

Raw materials

    $ 126,489      $ 126,401   

Work in process

      7,610        6,395   

Finished goods

      74,391        73,710   

Supplies and materials

      115,541        102,720   
  

 

 

    

 

 

  

Inventories at FIFO or average cost

      324,031        309,226   

Excess of FIFO or average cost over LIFO cost

      (69,356 )      (68,084 ) 
  

 

 

    

 

 

  

Inventories, net

    $ 254,675      $ 241,142   
  

 

 

    

 

 

  
Property, Plant And Equipment, At Cost
     December 31,  
     2011     2010  
     (In thousands)  

Land and land improvements

    $ 102,483      $ 98,197   

Buildings

      377,664        350,301   

Machinery and equipment

      3,045,145        2,753,258   

Construction in progress

      66,098        212,931   

Other

      27,170        24,834   
  

 

 

    

 

 

  

Property, plant and equipment, at cost

      3,618,560        3,439,521   

Less accumulated depreciation

      (2,141,906 )      (2,101,535 ) 
  

 

 

    

 

 

  

Property, plant and equipment, net

    $ 1,476,654      $ 1,337,986   
  

 

 

    

 

 

  
Estimated Useful Lives Of Assets

Buildings and land improvements

      5 to 40 years   

Machinery and equipment

      3 to 25 years   

Trucks and automobiles

      3 to 10 years   

Furniture and fixtures

      3 to 20 years   

Computers and hardware

      3 to 7 years   

Leasehold improvements

     

Period of the lease or  useful life, if shorter