Unpaid Claims - Summary of Reconcilation of Claims Incurred and Paid And Unpaid Claims (Details) - USD ($) $ in Thousands |
Mar. 31, 2021 |
Dec. 31, 2020 |
Mar. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|---|---|
| Roll Forward In Liability For Unpaid Claims And Claims Adjustment Expense [Abstract] | ||||
| Cumulative incurred claims, net | $ 1,552,841 | |||
| Less: cumulative paid claims, net | 1,448,865 | |||
| Net unpaid claims, including claims adjustment expenses | $ 117,582 | $ 103,976 | $ 90,353 | $ 77,886 |