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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	Jun. 30, 2023	Dec. 31, 2022
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due fromreinsurers	$ 414,109	$ 773,345
Florida Hurricane Catastrophe Fund “FHCF”
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due fromreinsurers	73,116	134,411
Cosaint Re Pte. Ltd.
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due fromreinsurers	17,452	0
Lumen Re Ltd.
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due fromreinsurers	0	8,913
Munich Reinsurance America Inc.
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due fromreinsurers	0	14,616
Everest Reinsurance Co
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due fromreinsurers	0	11,536
Upsilon RFO RE Ltd.
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due fromreinsurers	0	11,201
D E Shaw Re (Bermuda) Ltd
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due fromreinsurers	0	16,680
AM Best Company A Plus Rating | Moody's, Aa3 Rating | Standard & Poor's, AA- Rating | Allianz Risk Transfer
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due fromreinsurers	188,570	285,323
AM Best Company A Plus Rating | Moody's A1 Rating | Standard & Poor's, A Plus Rating | Renaissance Reinsurance Ltd.
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due fromreinsurers	14,463	38,768
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 fromreinsurers	39,545	101,482
AM Best, A Rating | Moody's, A2 Rating | Standard & Poor's, A Rating | Markel Bermuda Ltd.
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due fromreinsurers	26,806	50,981
AM Best, A Rating | Moody's, A3 Rating | Standard & Poor's, A Plus Rating | DaVinci Reinsurance Ltd.
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due fromreinsurers	20,372	48,115
AM Best, A++ Rating | Moody's, Aa3 Rating | Standard & Poor's, AA Rating | Chubb Tempest Reinsurance, Ltd.
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due fromreinsurers	$ 33,785	$ 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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