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Property, Plant & Equipment
3 Months Ended
Mar. 31, 2012
Property, Plant & Equipment [Abstract]  
Property, Plant & Equipment
6. Property, Plant & Equipment

The following is a summary of the Company's property, plant and equipment balances (in thousands of dollars):

   
March 31,
  
December 31,
 
   
2012
  
2011
 
        
Land
 $27,898  $28,021 
Land improvements
  17,411   17,376 
Buildings
  227,735   212,428 
Machinery and equipment
  324,490   310,352 
Furniture and fixtures
  9,128   9,144 
Computer equipment and software
  38,614   36,942 
Total property, plant and equipment
  645,276   614,263 
Less accumulated depreciation
  (274,105)  (267,833)
Total property, plant and equipment, net
 $371,171  $346,430 
          
Depreciation expense related to property, plant and equipment was $7.2 million and $5.1 million for the three months ended March 31, 2012 and 2011, respectively.