Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases
Property, plant and equipment, cost	$ 344,153	$ 327,183
Accumulated depreciation	104,062	81,299
Impairment of long-lived assets	0		$ 0
Finance leased assets
Leases
Property, plant and equipment, cost	299	299
Accumulated depreciation	$ 147	128
ROU asset
Leases
Impairment of long-lived assets		$ 2,845