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Allowance for Expected Credit Losses - Ceded credit risk (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Concentration Risk [Line Items] |  |  |  |
Reinsurance recoverable for paid and unpaid claims and claims adjustments |  | $ 6,563,654 | $ 5,880,735 | $ 4,500,802
Shareholders' equity | Reinsurer concentration risk | Largest balance due from any one carrier |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  | 9.00% | 6.70% |
AM Best "A-" Or Better Rating | Reinsurance recoverable | Reinsurer concentration risk |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  | 68.80% | 69.70% |
Rating Below A- | Reinsurance recoverable | Reinsurer concentration risk | All Other Carriers |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  | 0.10% | 0.10% |
No AM Best rating | Reinsurance recoverable | Reinsurer concentration risk | Reinsurance trusts or letters of credit |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  | 95.00% | 91.00% |
No AM Best rating | Reinsurance recoverable | Reinsurer concentration risk | All Other Carriers |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | [1] | 31.10% | 30.20% |
[1] | At December 31, 2022 and 2021 period, over 95% and 91% of such amount is collateralized through reinsurance trusts, funds withheld arrangements, letters of credit or other, respectively

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