Income taxes - Net operating loss carryfowards (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Operating Loss Carryforwards [Line Items]
Net operating loss and other carryforward available	$ 782,886
Tax Year 2023
Operating Loss Carryforwards [Line Items]
Net operating loss and other carryforward available	1,363
Tax Year 2024
Operating Loss Carryforwards [Line Items]
Net operating loss and other carryforward available	9,310
Tax Year 2025
Operating Loss Carryforwards [Line Items]
Net operating loss and other carryforward available	13,516
Tax Year 2026
Operating Loss Carryforwards [Line Items]
Net operating loss and other carryforward available	13,367
Tax Year 2027
Operating Loss Carryforwards [Line Items]
Net operating loss and other carryforward available	15,202
Tax Year 2028
Operating Loss Carryforwards [Line Items]
Net operating loss and other carryforward available	260,622
Tax Year 2029
Operating Loss Carryforwards [Line Items]
Net operating loss and other carryforward available	111,307
Tax Year 2030
Operating Loss Carryforwards [Line Items]
Net operating loss and other carryforward available	121,017
Tax Year 2031
Operating Loss Carryforwards [Line Items]
Net operating loss and other carryforward available	122,324
Tax Year 2032
Operating Loss Carryforwards [Line Items]
Net operating loss and other carryforward available	55,335
Tax Year 2033
Operating Loss Carryforwards [Line Items]
Net operating loss and other carryforward available	10,565
Tax Year 2034
Operating Loss Carryforwards [Line Items]
Net operating loss and other carryforward available	5,666
Tax Year 2035
Operating Loss Carryforwards [Line Items]
Net operating loss and other carryforward available	43,121
Tax Year 2036
Operating Loss Carryforwards [Line Items]
Net operating loss and other carryforward available	$ 171