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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2021
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):
 
    
2021
     
2020
  
Land
    $ 3,600      $ 3,600  
Buildings and improvements
      50,138        45,905  
Machinery and equipment
      247,926        233,635  
Furniture and fixtures
      9,825        8,429  
Construction
in-progress
and deposits
      48,088        17,987  
    
 
 
     
 
 
  
       359,577        309,556  
Accumulated depreciation and amortization
      (248,226 )       (239,162 ) 
Right of use asset — net
      4,624        4,449  
    
 
 
     
 
 
  
Net balance
    $ 115,975      $ 74,843  
    
 
 
     
 
 
  
 
Depreciation expense for the years ended December 31, 2021, 2020 and 2019 was approximately $11,609,000, $10,950,000, and $10,226,000, respectively. As of December 31, 2021, the Company had approximately $32,949,000 of capital expenditure commitments.