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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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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 825
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479383/944-825-50-1B

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Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479838/944-20-50-5

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479616/944-310-45-5

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(6))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

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