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INVESTMENTS - Realized Gains (Losses) on Investments (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2021
Debt Securities, Available-for-Sale [Line Items]
Proceeds from maturities/prepayments	$ 0	$ 422,000		$ 8,460,000
Fixed Maturities
Debt Securities, Available-for-Sale [Line Items]
Noncash related proceeds				(255,300)
Fixed Maturities \| Fixed maturities, available-for-sale
Debt Securities, Available-for-Sale [Line Items]
Proceeds from sales			$ 236,000	7,793,000
Proceeds from maturities/prepayments			273,000	411,000
Gross investment gains on sales and maturities			2,000	1,139,000
Gross investment losses on sales and maturities			(5,000)	(61,000)
Write-downs recognized in earnings			(23,000)	(23,000)
(Addition to) release of allowance for credit losses			$ 0	$ 0