Property, Plant and Equipment
 9 Months Ended
Sep. 30, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment

4. Property, Plant and Equipment

Property, plant and equipment as of September 30, 2016 and December 31, 2015 are comprised of the following (in thousands):

 

     September 30,
2016		      December 31,
2015		  

Buildings and related structures

    $ 71,205       $ 66,487   

Machinery and equipment

      274,311         256,259   

Vehicles and others

      32,503         27,075   
  

 

 

     

 

 

  
     378,019         349,821   

Less: accumulated depreciation

      (198,191 )       (172,546 ) 

Land

      15,725         14,710   
  

 

 

     

 

 

  

Property, plant and equipment, net

    $ 195,553       $ 191,985   
  

 

 

     

 

 

  

Aggregate depreciation expenses totaled $18,448 thousand and $19,810 thousand for the nine months ended September 30, 2016 and 2015, respectively.