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Property, Plant & Equipment (Tables)
6 Months Ended
Jun. 30, 2012
Property, Plant & Equipment [Abstract]  
Summary of property, plant and equipment balances
The following is a summary of the Company's property, plant and equipment balances (in thousands of dollars):

   
June 30,
  
December 31,
 
   
2012
  
2011
 
        
Land
 $27,724  $14,875 
Land improvements
  19,419   10,379 
Buildings
  216,635   137,923 
Machinery and equipment
  305,222   306,151 
Furniture and fixtures
  9,873   8,779 
Computer equipment and software
  58,121   16,359 
Construction in progress
  14,289   119,797 
Total property, plant and equipment
  651,283   614,263 
Less accumulated depreciation
  (272,068)  (267,833)
Total property, plant and equipment, net
 $379,215  $346,430