Variable interest entities ("VIEs") (Details) $ in Thousands	Dec. 31, 2024 USD ($) company	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Variable Interest Entity [Line Items]
Number of special purpose acquisition companies | company	2
Cash and cash equivalents	$ 33,150	$ 28,835	$ 112,433
Restricted cash	0	0	$ 25,534
Other assets	112,534	101,775
Total assets	3,382,726	2,874,816
Total liabilities	2,532,331	2,085,577
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Cash and cash equivalents	0	94
Restricted cash	0	0
Other assets	0	387
Total assets	0	481
Other Liabilities	0	171
Total liabilities	$ 0	$ 171