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Property, Plant & Equipment (Details) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Property, Plant and Equipment [Abstract]      
Property, plant and equipment $ 211,419,000   $ 209,333,000
Accumulated depreciation (131,021,000)   (128,148,000)
Property, plant and equipment — net 80,398,000   81,185,000
Depreciation expense 2,873,000 $ 2,978,000  
Capital additions in progress 3,421,000   $ 2,264,000
Purchase commitments for capital expenditures in progress $ 2,939,000 $ 1,100,000