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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2017
Property Plant and Equipment, Net

Property, plant and equipment, net consisted of the following at December 31, 2017 and 2016:

 

     2017      2016  
     (in thousands)  

Land

   $ 16,561      $ 16,561  

Buildings

     98,369        98,031  

Machinery and equipment

     647,961        601,835  

Furniture and fixtures, and software

     88,539        82,897  

Leasehold improvements

     49,540        46,612  

Construction in progress

     13,522        3,032  
  

 

 

    

 

 

 
     914,492        848,968  

Less: accumulated depreciation

     646,045        595,147  
  

 

 

    

 

 

 
   $ 268,447      $ 253,821