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Property, Plant & Equipment (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Property, Plant & Equipment    
Property, plant and equipment $ 173,644,000 $ 170,881,000
Accumulated depreciation (98,437,000) (91,675,000)
Property, Plant and Equipment, Net $ 75,207,000 $ 79,206,000