Description of Business and Summary of Significant Accounting Policies - Cash and cash equivalents (Details) $ in Thousands	Mar. 31, 2023 USD ($) state	Dec. 31, 2022 USD ($) state	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Description of Business and Summary of Significant Accounting Policies
Restricted cash pledged as collateral	$ 5,200	$ 5,100
Restricted cash pledged against obligations to policyholders and creditors	1,300	1,000
Restricted funds held for payment of possible warranty claims	$ 6,000	$ 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	179,357	215,060
Restricted cash and restricted cash equivalents - current	14,796	13,545
Cash, cash equivalents and restricted cash	$ 194,153	$ 228,605	$ 303,035	$ 324,792