Leases - Components of lease expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finance lease cost
Amortization of leased assets	$ 3,390	$ 1,452
Interest on lease liabilities	283	116
Total finance lease cost	3,673	1,568
Operating lease cost	9,615	7,580	$ 8,373
Short-term lease cost	9,192	3,626	2,577
Variable lease cost	647	772	624
Sublease income	(1,021)	(831)	(295)
Total operating lease cost	18,433	11,147	11,279
Total lease cost	$ 22,106	$ 12,715	$ 11,279