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Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | $ 789,378 | $ 762,422 | $ 723,530
Less accumulated depreciation and amortization | (460,625) | (432,392) | (419,108)
Property, plant and equipment excluding capital projects in progress, net | 328,753 | 330,030 | 304,422
Capital projects in progress | 53,755 | 31,525 | 36,811
Property, plant and equipment, net | 382,508 | 361,555 | 341,233
Land |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | 50,995 | 50,025 | 48,027
Buildings and site improvements |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | 233,694 | 233,123 | 220,684
Leasehold improvements |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | 7,690 | 6,367 | 5,698
Machinery, equipment, and software |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | $ 496,999 | $ 472,907 | $ 449,121

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