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INVESTMENTS - Equity Method Investments (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to acquire equity method investments | $ 12,389 | $ 11,289 |  |
Monarch Point Re (ISAC) Ltd. and Monarch Point Re (ISA 2023) Ltd |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to acquire equity method investments |  |  | $ 22,000 |
Equity method investment, ownership percentage (as a percent) |  |  | 18.00% |
Monarch Point Re (ISA 2024) Ltd., (Monarch Point Re (ISAC) Ltd., Monarch Point Re (ISA 2023) Ltd. and Monarch Point Re (ISA 2024) Ltd |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to acquire equity method investments | $ 12,000 |  |  |
Equity method investment, ownership percentage (as a percent) | 18.00% |  |  |
Harrington Reinsurance Holdings Limited |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to acquire equity method investments |  |  |  | $ 108,000
Equity method investment, ownership percentage (as a percent) |  |  | 20.00% | 19.00%
Equity method investment, difference between carrying amount and underlying equity |  |  |  | $ 5,000

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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
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