General form of registration statement for all companies including face-amount certificate companies

Property, plant, and equipment

v3.22.2
Property, plant, and equipment
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Abstract]    
Property, plant, and equipment
5. Property, plant, and equipment
The following table summarizes the components of our property, plant, and equipment, net as of March 31, 2022 and December 31, 2021:
 
     
(In thousands)
   
March 31,
2022
    
December 31,
2021
  
Machinery and equipment
    $ 1,018,221     $ 760,829  
Mining property and mine development
      35,491       34,809  
Office equipment, software and other
      13,876       5,550  
Buildings and leasehold improvements
      16,091       15,947  
    
 
 
    
 
 
  
Total
      1,083,679       817,135  
Less: accumulated depreciation and depletion
      (506,831 )      (464,178 ) 
Construction in progress
      42,923       10,730  
    
 
 
    
 
 
  
Property, plant, and equipment, net
    $ 619,771     $ 363,687  
Depreciation expense for the three months ended March 31, 2022 and 2021, was $44.2 million and $35.5 million, respectively. Major classifications of property, plant, and equipment and their respective useful lives are as follows:
 
Machinery and equipment
      2 years—10 years  
Office equipment, software, and other
      3 years—7 years  
Buildings and leasehold improvements
      2 years—40 years  
4. Property, plant, and equipment
The following table summarizes the components of our property, plant, and equipment, net as of December 31, 2021 and December 31, 2020:
 
     
     
December 31,
2021
    
December 31,
2020
  
Machinery and equipment
    $ 760,829     $ 738,312  
Mining property and mine development
      34,809       4,809  
Office equipment, software and other
      5,550       4,820  
Buildings and leasehold improvements
      15,947       16,695  
  
 
 
    
 
 
  
Total
      817,135       764,636  
Less: accumulated depreciation and depletion
      (464,178 )      (352,565 ) 
Construction in progress
      10,730       17,613  
  
 
 
    
 
 
  
Property, plant, and equipment, net
    $ 363,687     $ 429,684  
Depreciation expense for the years ended December 31, 2021 and 2020 was $140.7 million and $150.7 million, respectively.
Major classifications of property, plant, and equipment and their respective useful lives are as follows:
 
Machinery and equipment
      2 years—10 years  
Office equipment, software, and other
      3 years—7 years  
Buildings and leasehold improvements
      2 years—40 years