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Property, Plant and Equipment - Additional lease information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment    
Expenses relating to short-term leases $ 258 $ 313
Expenses relating to low-value asset leases 230 143
Expenses relating to variable lease payments not included in the measurement of lease liabilities $ 2,018 $ 1,631