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Property, Plant & Equipment (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Property, Plant and Equipment [Abstract]      
Property, plant and equipment $ 202,046,000   $ 200,525,000
Accumulated depreciation (120,316,000)   (117,258,000)
Property, plant and equipment — net 81,730,000   83,267,000
Depreciation expense 2,978,000 $ 2,517,000  
Capital additions in progress 6,508,000   $ 7,396,000
Purchase commitments for capital expenditures in progress $ 1,498,000 $ 2,812,000