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PROPERTY, PLANT AND EQUIPMENT (Tables)
9 Months Ended
Sep. 30, 2023
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Presented in the table below are the major classes of property, plant and equipment by category as of the below dates:
As of September 30, 2023
(in thousands)CostAccumulated DepreciationNet Book Value
Building$81,526 $1,893 $79,633 
Machinery and equipment329,656 19,836 309,820 
Leasehold Improvements2,957 1,284 1,673 
Fixtures and Furnishings679 151 528 
Land improvements150 30 120 
Land1,150 — 1,150 
Construction in process233,001 — 233,001 
Total property, plant and equipment$649,119 649,119 $23,194 $625,925 
As of December 31, 2022
(in thousands)CostAccumulated
Depreciation
Net Book Value
Building$12,534 $1,016 $11,518 
Machinery and equipment23,728 6,674 17,054 
Leasehold Improvements2,957 803 2,154 
Fixtures and Furnishings529 83 446 
Land improvements150 22 128 
Land1,150 — 1,150 
Construction in process473,269 — 473,269 
Total property, plant and equipment$514,317 $8,598 $505,719