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.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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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.

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- 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.

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INVESTMENTS - Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments	$ 6,791	$ 0
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	$ 7,000
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)				19.00%
Equity method investment, difference between carrying amount and underlying equity				$ 5,000