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Property, Plant & Equipment (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Property, Plant and Equipment [Abstract]            
Property, plant and equipment $ 215,942,000     $ 215,942,000   $ 209,333,000
Accumulated depreciation (136,771,000)     (136,771,000)   (128,148,000)
Property, plant and equipment — net 79,171,000     79,171,000   81,185,000
Depreciation expense 2,979,000   $ 2,812,000 8,766,000 $ 8,311,000  
Capital additions in progress $ 3,701,000     3,701,000   $ 2,264,000
Purchase commitments for capital expenditures in progress   $ 1,100,000   $ 3,184,000