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INVESTMENTS - Net Investment Gains (Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Gross realized investment gains |  |  |  |
Fixed maturities and short-term investments | $ 22,649 | $ 4,143 | $ 43,232 | $ 27,973
Equity securities | 1,667 | 8,433 | 32,292 | 9,968
Gross realized investment gains | 24,316 | 12,576 | 75,524 | 37,941
Gross realized investment losses |  |  |  |
Fixed maturities and short-term investments | (22,589) | (31,390) | (119,108) | (128,733)
Equity securities | (7,539) | (4) | (15,251) | (400)
Mortgage loans | (4,275) | 0 | (4,275) | 0
Gross realized investment losses | (34,403) | (31,394) | (138,634) | (129,133)
(Increase) decrease in allowance for expected credit losses, fixed maturities, available for sale | 209 | 1,618 | 6,338 | 2,800
(Increase) decrease in allowance for expected credit losses, mortgage loans | (1,343) | (541) | (15,771) | (4,179)
Impairment losses | (14) | (41) | (178) | (9,124)
Change in fair value of investment derivatives | (870) | 1,692 | 153 | 218
Net unrealized gains (losses) on equity securities | 44,287 | (37,024) | 42,065 | 3,806
Total net investment gains (losses) | $ 32,182 | $ (53,114) | $ (30,503) | $ (97,671)

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- Definition Amount of realized loss on investments, including debt and equity securities and mortgage loans held for investment. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition This item represents the net realized gains and losses on available for sale debt securities, the net realized and unrealized gains and losses on equity securities with FV recorded in net income, together with the change in fair value of investment derivatives, and expected and realized credit losses. + References No definition available. + Details
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- Definition Amount, excluding accrued interest, of increase (decrease) in allowance for credit loss of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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- Definition Amount, excluding accrued interest, of decrease in 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) from writeoff. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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- Definition Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-4 + Details
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- Definition Amount, excluding accrued interest, of increase (decrease) in allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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