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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | $ 36,009,821 | $ 38,537,462 |  |
Fixed maturity securities, available for sale, gross unrealized gains | 168,432 | 237,889 |  |
Fixed maturity securities, available for sale, gross unrealized losses | (4,130,356) | (3,990,839) |  |
Fixed maturity securities, available for sale, allowance for credit losses | (3,518) | (4,030) | $ (2,047) | $ (3,347)
Fair Value | $ 32,044,379 | 34,780,482 |  |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Accrued investment income (2024 and 2023 include $4,136 and $2,862 related to consolidated variable interest entities) |  |  |
Accrued interest receivable | $ 352,800 | 360,900 |  |
U.S. Government and agencies |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 28,354 | 172,683 |  |
Fixed maturity securities, available for sale, gross unrealized gains | 13 | 606 |  |
Fixed maturity securities, available for sale, gross unrealized losses | (1,230) | (2,148) |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 | 0 |  |
Fair Value | 27,137 | 171,141 |  |
States, municipalities and territories |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 3,392,780 | 3,654,571 |  |
Fixed maturity securities, available for sale, gross unrealized gains | 9,188 | 17,477 |  |
Fixed maturity securities, available for sale, gross unrealized losses | (584,994) | (573,108) |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 | 0 |  |
Fair Value | 2,816,974 | 3,098,940 |  |
Foreign corporate securities and foreign governments |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 513,299 | 563,890 |  |
Fixed maturity securities, available for sale, gross unrealized gains | 643 | 1,669 |  |
Fixed maturity securities, available for sale, gross unrealized losses | (80,934) | (71,820) |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 | 0 |  |
Fair Value | 433,008 | 493,739 |  |
Corporate securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 21,952,356 | 23,036,862 |  |
Fixed maturity securities, available for sale, gross unrealized gains | 124,669 | 175,014 |  |
Fixed maturity securities, available for sale, gross unrealized losses | (2,808,944) | (2,605,048) |  |
Fixed maturity securities, available for sale, allowance for credit losses | (3,293) | (3,412) | (1,914) | (3,214)
Fair Value | 19,264,788 | 20,603,416 |  |
Residential mortgage backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 1,093,654 | 1,503,639 |  |
Fixed maturity securities, available for sale, gross unrealized gains | 9,209 | 11,598 |  |
Fixed maturity securities, available for sale, gross unrealized losses | (107,733) | (112,736) |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 | 0 | (133) | (133)
Fair Value | 995,130 | 1,402,501 |  |
Commercial mortgage backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 3,121,755 | 3,405,647 |  |
Fixed maturity securities, available for sale, gross unrealized gains | 2,701 | 995 |  |
Fixed maturity securities, available for sale, gross unrealized losses | (390,371) | (454,095) |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 | 0 |  |
Fair Value | 2,734,085 | 2,952,547 |  |
Other asset backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 5,907,623 | 6,200,170 |  |
Fixed maturity securities, available for sale, gross unrealized gains | 22,009 | 30,530 |  |
Fixed maturity securities, available for sale, gross unrealized losses | (156,150) | (171,884) |  |
Fixed maturity securities, available for sale, allowance for credit losses | (225) | (618) | $ 0 | $ 0
Fair Value | $ 5,773,257 | $ 6,058,198 |  |

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