Leases - Components of lease expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finance lease cost
Amortization of leased assets	$ 129	$ 3,390	$ 1,452
Interest on lease liabilities	13	283	116
Total finance lease cost	142	3,673	1,568
Interest on finance obligation	35
Operating lease cost	15,096	9,615	7,580
Short-term lease cost	1,862	9,192	3,626
Variable lease cost	774	647	772
Sublease income	(1,400)	(1,021)	(831)
Total operating lease cost	16,332	18,433	11,147
Total lease cost	$ 16,509	$ 22,106	$ 12,715