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Property, Plant & Equipment (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Property, Plant and Equipment [Abstract]          
Property, plant and equipment $ 196,731,000   $ 196,731,000   $ 183,500,000
Accumulated depreciation (115,288,000)   (115,288,000)   (107,603,000)
Property, plant and equipment — net 81,443,000   81,443,000   75,897,000
Depreciation expense 2,683,000 $ 2,471,000 7,685,000 $ 7,414,000  
Capital additions in progress $ 13,019,000   13,019,000   $ 6,605,000
Purchase commitments for capital expenditures in progress     $ 1,078,000 $ 5,315,000