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Property, Plant & Equipment (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Property, Plant and Equipment [Abstract]          
Property, plant and equipment $ 192,012,000   $ 192,012,000   $ 183,500,000
Accumulated depreciation (112,605,000)   (112,605,000)   (107,603,000)
Property, plant and equipment — net 79,407,000   79,407,000   75,897,000
Depreciation expense 2,485,000 $ 2,461,000 5,002,000 $ 4,943,000  
Capital additions in progress $ 10,967,000   10,967,000   $ 6,605,000
Purchase commitments for capital expenditures in progress     $ 5,923,000 $ 5,315,000