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Property, Plant & Equipment
9 Months Ended
Sep. 30, 2011
Property, Plant & Equipment [Abstract] 
Property, Plant & Equipment
7. Property, Plant & Equipment
 
The following is a summary of the Company's property, plant and equipment balances (in thousands of dollars):

   
September 30,
  
December 31,
 
   
2011
  
2010
 
        
Land
 $19,880  $19,775 
Land improvements
  10,322   10,449 
Buildings
  158,380   106,199 
Machinery and equipment
  302,322   289,579 
Furniture and fixtures
  6,833   6,839 
Computer equipment and software
  32,517   23,407 
Total property, plant and equipment
  530,254   456,248 
Less accumulated depreciation
  (264,050)  (252,531)
Total property, plant and equipment, net
 $266,204  $203,717 
 
Depreciation expense related to property, plant and equipment was $5.5 million and $4.9 million for the three months ended September 30, 2011 and 2010, respectively and was $15.8 million and $14.2 million for the nine months ended September 30, 2011 and 2010, respectively.