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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
6    Property, Plant and Equipment
Property, plant and equipment consist of the following (in thousands):
 
December 31,
 
  
2019
 
  
2018
 
Land and land improvements
  $
37,040
    $
36,554
 
Buildings and leasehold improvements
   
355,425
     
299,103
 
Production and other equipment
   
537,211
     
494,302
 
Construction in progress
   
57,985
     
41,909
 
                 
Total property, plant and equipment
   
987,661
     
871,868
 
Less: accumulated depreciation and amortization
   
(570,319
 )    
(528,785
 )
                 
Property, plant and equipment, net
  $
417,342
    $
343,083
 
                 
In February 2018, the Company’s Board of Directors approved expanding its precision chemistry consumable manufacturing operations in the U.S. The Company anticipates spending an estimated $215 million to build and equip this new
state-of-the-art
manufacturing facility, and has spent $85 million on this facility through December 31, 2019.
During 2019, 2018 and 2017, the Company retired and disposed of approximately $11
 
million, $9 million and $15 million of property, plant and equipment, respectively, most of which was fully depreciated and no longer in use. Gains on disposals were immaterial for the years ended December 31, 2019, 2018 and 2017.