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Property Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Property Plant and Equipment    
Land $ 4,084 $ 4,092
Plant and buildings 97,168 97,398
Furniture and fixtures 1,305 1,195
Machinery and equipment 5,298 5,188
Construction in progress 44,322 25,397
Property held for development 15,414 15,408
Finance lease right of use assets 2,317 2,308
Total gross property, plant & equipment 169,908 150,986
Less accumulated depreciation (44,993) (41,106)
Total net property, plant & equipment $ 124,915 $ 109,880