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Reinsurance - Current Ratings from Rating Agencies and Unsecured Net Amounts Due from Reinsurers Whose Aggregate Balance Exceeded 3% of Stockholders' Equity (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | $ 209,519 | $ 773,345
Florida Hurricane Catastrophe Fund “FHCF” |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 62,095 | 134,411
Ada Re, Ltd |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 12,251 | 0
Upsilon RFO Re Ltd |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 10,930 | 11,201
Aeolus Re Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 10,493 | 0
Allianz Risk Transfer (Bermuda) Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 0 | 285,323
Markel Bermuda Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 0 | 50,981
D E Shaw Re (Bermuda) Ltd |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 0 | 16,680
Munich Reinsurance America Inc. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 0 | 14,616
Lumen Re Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 0 | 8,913
AM Best, A Rating | Standard & Poor's, A Plus Rating | Various Lloyd’s of London Syndicates |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 34,367 | 101,482
AM Best, A Rating | Standard & Poor's, A Plus Rating | Moody's, A3 Rating | DaVinci Reinsurance Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 28,586 | 48,115
AM Best Company A Plus Rating | Standard & Poor's, A Plus Rating | Moody's A1 Rating | Renaissance Reinsurance Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 20,935 | 38,768
AM Best Company A Plus Rating | Standard & Poor's, A Plus Rating | Moody's A1 Rating | Everest Reinsurance Co |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 11,668 | 11,536
AM Best, A++ Rating | Standard & Poor's, AA Rating | Moody's, Aa3 Rating | Chubb Tempest Reinsurance, Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | $ 18,194 | $ 51,319

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