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PROPERTY AND EQUIPMENT
12 Months Ended
Dec. 31, 2011
PROPERTY AND EQUIPMENT  
PROPERTY AND EQUIPMENT

5. PROPERTY AND EQUIPMENT

 
  December 31,  
 
  2011   2010  
 
  (in thousands)
 

Land

  $ 18,767   $ 19,259  

Buildings and site improvements

    70,488     73,170  

Equipment and machinery

    233,194     237,718  

Construction in progress

    1,836     1,959  
           

Total

    324,285     332,106  

Less: accumulated depreciation

    138,444     127,208  
           

Total property and equipment, net

  $ 185,841   $ 204,898  
           

        Depreciation expense related to cost of sales for the years ended December 31, 2011, 2010 and 2009 was $27.6 million, $26.1 million and $21.4 million, respectively. During the fourth quarter of 2010 the Company changed an accounting estimate related to certain equipment to eliminate salvage values. The Company is depreciating the remaining net book value of those assets over their remaining estimated economic lives on a prospective basis. The impact of the change in 2010 was $3.0 million.

        Depreciation expense included in depreciation and amortization expense for the years ended December 31, 2011, 2010 and 2009 was $2.6 million, $2.9 million and $1.8 million, respectively.

        In addition, the Company separately classified $2.1 million and $1.1 million of land, buildings and plant equipment as held for sale in the consolidated balance sheet as of December 31, 2011 and 2010.