Variable interest entities ("VIEs") (Details) $ in Thousands	Jun. 30, 2024 USD ($) company	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)
Variable Interest Entity [Abstract]
Number of special purpose acquisition companies | company	2
Asset
Cash and cash equivalents	$ 33,214	$ 28,835	$ 29,145
Restricted Cash	0		25,803
Other Assets	101,908	101,775
Total assets	3,262,538	2,874,816
Liabilities
Total liabilities	2,450,478	$ 2,085,577
Variable Interest Entity, Primary Beneficiary
Asset
Cash and cash equivalents	0		5,487
Restricted Cash	0		25,803
Other Assets	0		2,297
Total assets	0		33,587
Liabilities
Other Liabilities	0		821
Total liabilities	$ 0		$ 821