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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
6.  PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment are stated at cost and are depreciated and amortized over a period of three to 39 years generally under the straight-line method for financial reporting purposes and accelerated methods for income tax purposes.
Property, plant and equipment as of December 31 were as follows (in thousands):
 
 
  
2022
 
  
2021
 
Land
    $ 3,600      $ 3,600  
Buildings and improvements
      73,520        50,138  
Machinery and equipment
      271,021        247,926  
Furniture and fixtures
      15,297        9,825  
Construction
in-progress
and deposits
      52,937        48,088  
    
 
 
     
 
 
  
       416,375        359,577  
Accumulated depreciation and amortization
      (258,570 )       (248,226 ) 
Right of use asset
 — net
      8,204        4,624  
    
 
 
     
 
 
  
Net balance
    $ 166,009      $ 115,975  
    
 
 
     
 
 
  
Depreciation expense for the years ended December 31, 2022, 2021 and 2020 was approximately $13,701,000, $11,609,000, and $10,950,000, respectively. As of December 31, 2022, the Company had approximately $24,205,000 of capital expenditure commitments.