Unpaid Claims - Paid Claims (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Claims Development [Line Items]
Cumulative net paid claims	$ 3,232,576	$ 2,249,623	$ 1,443,830
2020 and prior
Claims Development [Line Items]
Cumulative net paid claims	1,562,766	1,557,507	1,443,830
2021
Claims Development [Line Items]
Cumulative net paid claims	777,315	692,116	0
2022
Claims Development [Line Items]
Cumulative net paid claims	$ 892,495	$ 0	$ 0