Variable interest entities ("VIEs") (Details) $ in Thousands	Dec. 20, 2022 shares	Oct. 26, 2021 USD ($)	Sep. 30, 2023 USD ($) company shares	Jul. 06, 2023 shares	Jun. 30, 2023 shares	Dec. 31, 2022 USD ($) shares	Dec. 13, 2022 shares	Sep. 30, 2022 USD ($) shares	Jul. 29, 2022 shares	Jun. 30, 2022 shares	May 24, 2022 shares	Feb. 28, 2022 shares	Dec. 31, 2021 shares
Variable Interest Entity [Line Items]
Number of special purpose acquisition companies | company			2
Cash and cash equivalents			$ 30,773			$ 112,433		$ 36,578
Restricted Cash			25,949			25,534		$ 128,280
Other Assets			186,275			184,443
Total assets			2,975,374			2,714,392
Total liabilities			$ 2,170,085			$ 1,893,971
IPO
Variable Interest Entity [Line Items]
Proceeds from Company sponsored Initial Public Offering		$ 126,500
Shares exercised their redemption rights (in shares) | shares	10,170,490
Class A Stock
Variable Interest Entity [Line Items]
Common stock, outstanding (in shares) | shares			10,289,233	10,447,392	10,884,575	10,868,556	10,867,660	10,874,990	11,251,930	11,270,944	11,863,559	12,322,073	12,447,036
Class A Stock | IPO
Variable Interest Entity [Line Items]
Common stock, outstanding (in shares) | shares	12,650,000
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Proceeds from Company sponsored Initial Public Offering		$ 126,500
Cash and cash equivalents			$ 5,348					$ 1,369
Restricted Cash			25,949					128,280
Other Assets			1,801					456
Total assets			33,098					130,105
Other Liabilities			942					189
Total liabilities			$ 942					$ 189