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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment

Property, plant and equipment consist of the following (in thousands):

 

     December 31,  
     2018     2017  

Land and land improvements

   $ 36,554     $ 37,525  

Buildings and leasehold improvements

     299,103       294,219  

Production and other equipment

     494,302       484,475  

Construction in progress

     41,909       22,140  
  

 

 

   

 

 

 

Total property, plant and equipment

     871,868       838,359  

Less: accumulated depreciation and amortization

     (528,785     (489,081
  

 

 

   

 

 

 

Property, plant and equipment, net

   $ 343,083     $ 349,278