Description of Business and Summary of Significant Accounting Policies - Cash and cash equivalents (Details) $ in Thousands	Jun. 30, 2023 USD ($) state	Dec. 31, 2022 USD ($) state	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Description of Business and Summary of Significant Accounting Policies
Restricted cash pledged as collateral		$ 5,100
Restricted cash pledged against obligations to policyholders and creditors	$ 1,300	1,000
Restricted funds held for payment of possible warranty claims	$ 6,500	$ 5,000
Number of states regulatory guidelines of warranty claims | state	17	19
Indemnification hold back cost	$ 2,400	$ 2,400
Cash and cash equivalents	265,573	215,060
Total restricted cash	39,277	13,545
Cash, cash equivalents and restricted cash	$ 304,850	$ 228,605	$ 282,077	$ 324,792