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Investments in Fixed Maturity Securities (AFS Allowance for Credit Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for expected credit losses, beginning of period | $ 22,831 | $ 37,142 | $ 36,708 | $ 37,352
Expected credit losses on securities for which credit losses were not previously recorded | 1,439 | 2,305 | 2,001 | 2,491
Expected credit (gains) losses on securities for which credit losses were previously recorded | (1,872) | 4,803 | (16,311) | 4,412
Reduction due to disposals | (561) | (2) | (561) | (7)
Allowance for expected credit losses, end of period | 21,837 | 44,248 | 21,837 | 44,248
Foreign government |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for expected credit losses, beginning of period | 20,479 | 33,324 | 29,603 | 32,633
Expected credit losses on securities for which credit losses were not previously recorded | 300 | 0 | 300 | 0
Expected credit (gains) losses on securities for which credit losses were previously recorded | (1,310) | (272) | (10,434) | 419
Reduction due to disposals | 0 | 0 | 0 | 0
Allowance for expected credit losses, end of period | 19,469 | 33,052 | 19,469 | 33,052
Corporate |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for expected credit losses, beginning of period | 0 | 3,795 | 5,026 | 4,701
Expected credit losses on securities for which credit losses were not previously recorded | 0 | 0 | 0 | 186
Expected credit (gains) losses on securities for which credit losses were previously recorded | 0 | 5,074 | (5,026) | 3,987
Reduction due to disposals | 0 | (2) | 0 | (7)
Allowance for expected credit losses, end of period | 0 | 8,867 | 0 | 8,867
Mortgage-backed |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for expected credit losses, beginning of period | 562 | 23 | 158 | 18
Expected credit losses on securities for which credit losses were not previously recorded | 1,139 | 861 | 1,701 | 861
Expected credit (gains) losses on securities for which credit losses were previously recorded | 0 | 1 | (158) | 6
Reduction due to disposals | (561) | 0 | (561) | 0
Allowance for expected credit losses, end of period | 1,140 | 885 | 1,140 | 885
Asset-backed |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for expected credit losses, beginning of period | 1,097 | 0 | 1,164 | 0
Expected credit losses on securities for which credit losses were not previously recorded | 0 | 1,444 | 0 | 1,444
Expected credit (gains) losses on securities for which credit losses were previously recorded | (208) | 0 | (275) | 0
Reduction due to disposals | 0 | 0 | 0 | 0
Allowance for expected credit losses, end of period | 889 | $ 1,444 | 889 | $ 1,444
State and municipal |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for expected credit losses, beginning of period | 693 |  | 757 |
Expected credit losses on securities for which credit losses were not previously recorded | 0 |  | 0 |
Expected credit (gains) losses on securities for which credit losses were previously recorded | (354) |  | (418) |
Reduction due to disposals | 0 |  | 0 |
Allowance for expected credit losses, end of period | $ 339 |  | $ 339 |

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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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- Definition Amount 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 sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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