FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fixed maturities, held to maturity, at amortized cost	$ 698,351	$ 446,016
Fair value	674,743	445,033
Advances from FHLB	81,388	0
Borrowings from FHLB	81,000	0
Reported Value Measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	1,312,000	1,311,000
Estimate of Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	$ 1,160,000	$ 1,453,000

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Amount excluding accrued interest, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value portion of notes payable.

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