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Investments in Fixed Maturity Securities (AFS Allowance for Credit Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for expected credit losses at January 1, 2020 | $ 37,352 | $ 22,238
Expected credit losses on securities for which credit losses were not previously recorded | 5,013 | 4,579
Expected credit losses on securities for which credit losses were previously recorded | (5,648) | 10,573
Reduction due to disposals | (9) | (38)
Allowance for expected credit losses at September 30, 2020 | 36,708 | 37,352
Foreign Government |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for expected credit losses at January 1, 2020 | 32,633 | 22,222
Expected credit losses on securities for which credit losses were not previously recorded | 0 | 1,910
Expected credit losses on securities for which credit losses were previously recorded | (3,030) | 8,534
Reduction due to disposals | 0 | (33)
Allowance for expected credit losses at September 30, 2020 | 29,603 | 32,633
Corporate |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for expected credit losses at January 1, 2020 | 4,701 | 16
Expected credit losses on securities for which credit losses were not previously recorded | 982 | 2,648
Expected credit losses on securities for which credit losses were previously recorded | (650) | 2,042
Reduction due to disposals | (7) | (5)
Allowance for expected credit losses at September 30, 2020 | 5,026 | 4,701
Mortgage- Backed |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for expected credit losses at January 1, 2020 | 18 | 0
Expected credit losses on securities for which credit losses were not previously recorded | 1,766 | 21
Expected credit losses on securities for which credit losses were previously recorded | (1,624) | (3)
Reduction due to disposals | (2) | 0
Allowance for expected credit losses at September 30, 2020 | 158 | 18
Asset-backed |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for expected credit losses at January 1, 2020 | 0 |
Expected credit losses on securities for which credit losses were not previously recorded | 1,444 |
Expected credit losses on securities for which credit losses were previously recorded | (280) |
Reduction due to disposals | 0 |
Allowance for expected credit losses at September 30, 2020 | 1,164 | 0
State and municipal |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for expected credit losses at January 1, 2020 | 0 |
Expected credit losses on securities for which credit losses were not previously recorded | 821 |
Expected credit losses on securities for which credit losses were previously recorded | (64) |
Reduction due to disposals | 0 |
Allowance for expected credit losses at September 30, 2020 | $ 757 | $ 0

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- Definition Amount 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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- Definition Amount of expense 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), for which no credit loss was previously recorded. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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- Definition Amount of expense (reversal of expense) for 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), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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