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Investments in Fixed Maturity Securities (AFS Allowance for Credit Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance, beginning of period | $ 21,837 | $ 44,248 | $ 36,708 | $ 37,352
Change on securities for which credit losses were not previously recorded | 47 | 2,482 | 2,048 | 4,973
Change on securities for which credit losses were previously recorded | (14,552) | (366) | (30,863) | 4,046
Reduction due to disposals | (379) | 0 | (940) | (7)
Balance, end of period | 6,953 | 46,364 | 6,953 | 46,364
Foreign government |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance, beginning of period | 19,469 | 33,052 | 29,603 | 32,633
Change on securities for which credit losses were not previously recorded | 47 | 0 | 347 | 0
Change on securities for which credit losses were previously recorded | (12,782) | 3,119 | (23,216) | 3,538
Reduction due to disposals | (379) | 0 | (379) | 0
Balance, end of period | 6,355 | 36,171 | 6,355 | 36,171
Corporate |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance, beginning of period | 0 | 8,867 | 5,026 | 4,701
Change on securities for which credit losses were not previously recorded | 0 | 756 | 0 | 942
Change on securities for which credit losses were previously recorded | 0 | (3,853) | (5,026) | 134
Reduction due to disposals | 0 | 0 | 0 | (7)
Balance, end of period | 0 | 5,770 | 0 | 5,770
Mortgage-backed |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance, beginning of period | 1,140 | 885 | 158 | 18
Change on securities for which credit losses were not previously recorded | 0 | 905 | 1,701 | 1,766
Change on securities for which credit losses were previously recorded | (1,088) | 310 | (1,246) | 316
Reduction due to disposals | 0 | 0 | (561) | 0
Balance, end of period | 52 | 2,100 | 52 | 2,100
Asset-backed |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance, beginning of period | 889 | 1,444 | 1,164 | 0
Change on securities for which credit losses were not previously recorded | 0 | 0 | 0 | 1,444
Change on securities for which credit losses were previously recorded | (343) | 58 | (618) | 58
Reduction due to disposals | 0 | 0 | 0 | 0
Balance, end of period | 546 | 1,502 | 546 | 1,502
State and municipal |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance, beginning of period | 339 | 0 | 757 | 0
Change on securities for which credit losses were not previously recorded | 0 | 821 | 0 | 821
Change on securities for which credit losses were previously recorded | (339) | 0 | (757) | 0
Reduction due to disposals | 0 | 0 | 0 | 0
Balance, end of period | $ 0 | $ 821 | $ 0 | $ 821

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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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