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REINSURANCE - Schedule of Ratings from Rating Agencies and Unsecured Amounts Due from Reinsurers Exceeded 3% of Stockholders' Equity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers	$ 257,070	$ 615,634
Various Lloyd’s of London Syndicates
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers	81,469	282,826
Markel Bermuda Ltd.
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers	60,919	94,173
Florida Hurricane Catastrophe Fund “FHCF”
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers	36,953	81,375
Renaissance Reinsurance Ltd.
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers	29,474	35,808
Everest Reinsurance Co
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers	24,837	47,807
DaVinci Reinsurance Ltd.
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers	$ 23,418	$ 73,645
Customers with Greater than 3% of Equity | Stockholders' Equity, Total | Amounts Due From Reinsurers
Ceded Credit Risk [Line Items]
Unsecured amounts due from reinsurers exceeding a fixed percentage of stockholders equity	3.00%

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 825
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477351/944-825-50-1B

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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-Paragraph 1B
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-Publisher FASB
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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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-Section 50
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-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 275
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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-Section 50
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-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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