Income taxes - Net operating loss carryfowards (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Operating Loss Carryforwards
Net operating loss and other carryforward available	$ 662,490
Tax Year 2025
Operating Loss Carryforwards
Net operating loss and other carryforward available	45
Tax Year 2026
Operating Loss Carryforwards
Net operating loss and other carryforward available	0
Tax Year 2027
Operating Loss Carryforwards
Net operating loss and other carryforward available	0
Tax Year 2028
Operating Loss Carryforwards
Net operating loss and other carryforward available	225,301
Tax Year 2029
Operating Loss Carryforwards
Net operating loss and other carryforward available	118,823
Tax Year 2030
Operating Loss Carryforwards
Net operating loss and other carryforward available	127,798
Tax Year 2031
Operating Loss Carryforwards
Net operating loss and other carryforward available	103,594
Tax Year 2032
Operating Loss Carryforwards
Net operating loss and other carryforward available	15,836
Tax Year 2033
Operating Loss Carryforwards
Net operating loss and other carryforward available	20,738
Tax Year 2034
Operating Loss Carryforwards
Net operating loss and other carryforward available	0
Tax Year 2035
Operating Loss Carryforwards
Net operating loss and other carryforward available	$ 50,356