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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment as of December 31 were as follows (in thousands):
 
    
2020
    
2019
 
Land
   $ 3,600      $ 3,600  
Buildings and improvements
     45,905        45,791  
Machinery and equipment
     233,635        220,405  
Furniture and fixtures
     8,429        8,231  
Construction
in-progress
and deposits
     17,987        4,362  
    
 
 
    
 
 
 
       309,556        282,389  
Accumulated depreciation and amortization
     (239,162      (229,698
Right of use asset — net
     4,449        4,261  
    
 
 
    
 
 
 
Net balance
   $ 74,843      $ 56,952