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6. Property, Plant and Equipment
3 Months Ended
Mar. 31, 2015
Property, Plant and Equipment [Abstract]  
6. Property, Plant and Equipment

Property, plant and equipment consisted of the following for the periods indicated (in thousands):

 

    March 31, 2015     December 31, 2014  
Land improvements   $ 103     $ 103  
Building and improvements     25,056       16,196  
Machinery and equipment     65,384       61,529  
Furniture and fixtures     1,974       1,938  
Computer equipment and software     5,372       4,712  
Transportation equipment     272       270  
      98,161       84,748  
Less accumulated depreciation and amortization     (35,519 )     (32,412 )
      62,642       52,336  
Construction in progress     5,769       11,371  
Land     1,101       1,101  
Property, plant and equipment, net   $ 69,512     $ 64,808  

 

For the three months ended March 31, 2015 and 2014, depreciation expense of property, plant and equipment was $1.9 million and $1.2 million, respectively.