Variable interest entities ("VIEs") (Details) $ in Thousands	Sep. 30, 2024 USD ($) company	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)
Variable Interest Entity [Abstract]
Number of special purpose acquisition companies | company	2
Asset
Cash and cash equivalents	$ 32,242	$ 28,835	$ 30,773
Restricted Cash	0		25,949
Other Assets	94,865	101,775
Total assets	3,367,285	2,874,816
Liabilities
Total liabilities	2,529,447	$ 2,085,577
Variable Interest Entity, Primary Beneficiary
Asset
Cash and cash equivalents	0		5,348
Restricted Cash	0		25,949
Other Assets	0		1,801
Total assets	0		33,098
Liabilities
Other Liabilities	0		942
Total liabilities	$ 0		$ 942