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INVESTMENTS (Net Investment Gains) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Gross realized investment gains
Fixed maturities and short-term investments	$ 50,170	$ 39,931
Equity securities	569	1,920
Gross realized investment gains	50,739	41,851
Gross realized investment losses
Fixed maturities and short-term investments	(19,368)	(22,766)
Equity securities	(89)	(2,682)
Gross realized investment losses	(19,457)	(25,448)
Allowance for expected credit losses	89	(20,019)
Impairment losses	0	(1,190)
Change in fair value of investment derivatives	1,749	3,162
Net unrealized gains (losses) on equity securities	(3,475)	(61,233)
Total net investment gains (losses)	$ 29,645	$ (62,877)

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities, the change in fair value of investment-related derivatives not designated as hedges and any hedge ineffectiveness recognized in earnings in relation to investment portfolio-related fair value hedges.

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Amount of realized gain on investment in debt and equity securities.

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Amount of realized loss on investment in debt and equity securities.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments and relating to the entity's investment portfolio.

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Amount of writeoff of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), from change in present value of expected cash flows.

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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