Summary of Significant Accounting Policies - Summary of Deferred Policy Acquisition Cost Amortization and Net Advertising Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Deferred policy acquisition cost amortization	$ 654,612	$ 633,385	$ 627,788
Net advertising expense	$ 11,800	$ 50,100	$ 37,700