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Property, Plant and Equipment, net
12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment, net [Abstract]  
Property, Plant and Equipment, net
8.
Property, Plant and Equipment, net

Property, plant and equipment, net consist of the following:


  
December 31,
 
  
2014
  
2013
 
Land
 
$
3,293
  
$
3,229
 
Buildings and improvements
  
31,067
   
25,216
 
Machinery and equipment
  
117,973
   
82,420
 
Construction in progress
  
4,764
   
4,042
 
   
157,097
   
114,907
 
Accumulated depreciation
  
(86,436
)
  
(74,011
)
Property, plant and equipment, net
 
$
70,661
  
$
40,896
 
 
Depreciation expense for the years ended December 31, 2014, 2013 and 2012 was $14.3 million, $10.5 million and $8.4 million, respectively.