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Property, Plant and Equipment (Tables)
6 Months Ended
Jun. 30, 2011
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
 
                 
    June 30,
    December 31,
 
    2011     2010  
 
(In thousands)
               
Land
  $ 34,404     $ 32,775  
Building
    206,559       201,866  
Machinery and equipment
    678,499       663,642  
Construction-in-progress
    19,046       12,412  
                 
Gross property, plant and equipment
    938,508       910,695  
Less: Accumulated depreciation
    631,019       604,899  
                 
Net property, plant and equipment
  $ 307,489     $ 305,796