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Property, Plant and Equipment (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Property, Plant and Equipment        
Depreciation expense $ 300 $ 700 $ 1,576 $ 1,995