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Reinsurance - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Premiums receivable | $ 7,280,682 | $ 5,139,471 |
Premium receivable, allowance for credit loss | 3,514 | 4,606 | $ 2,776
Reinsurance Recoverables, Including Reinsurance Premium Paid | 5,300,000 | 4,700,000 |
Reinsurance recoverable, allowance for credit loss | $ 13,279 | $ 12,169 | $ 8,344
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer One |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 17.60% | 20.80% |
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer Two |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 14.30% | 7.00% |
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer Three |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 8.70% | 5.40% |
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer One |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 10.90% | 14.30% |
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer Two |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 10.70% | 9.10% |
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer Three |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 8.10% | 8.00% |
Ceded Credit Risk, Secured | Reinsurance Recoverable | Reinsurer Concentration Risk |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 60.60% | 47.20% |
Rated A- or higher | Ceded Credit Risk, Unsecured | Reinsurance Recoverable | Reinsurer Concentration Risk |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 38.50% | 52.00% |
Rated lower than A- | Ceded Credit Risk, Unsecured | Reinsurance Recoverable | Reinsurer Concentration Risk |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 0.90% | 0.80% |

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