Variable interest entities ("VIEs") (Details) $ in Thousands	Oct. 26, 2021 USD ($)	Mar. 31, 2022 USD ($) company	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)
Variable Interest Entity [Line Items]
Number of special purpose acquisition companies | company		2
Proceeds from Company sponsored Initial Public Offering	$ 126,500
Cash and cash equivalents		$ 47,453	$ 213,759	$ 28,545
Restricted cash		127,781	127,765	0
Other assets		175,516	205,838
Total Assets		3,019,457	3,043,250
Total Liabilities		2,074,746	$ 2,090,220
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Proceeds from Company sponsored Initial Public Offering	$ 126,500
Cash and cash equivalents		1,633		0
Restricted cash		127,781		0
Other assets		680		0
Total Assets		130,094		0
Other Liabilities		63		0
Total Liabilities		$ 63		$ 0