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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | $ 37,813,550 |  | $ 44,866,019 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized gains | 77,897 |  | 225,792 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | (5,802,897) |  | (5,283,847) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | (3,618) | $ (4,146) | (3,347) |  | $ (4,920) | $ (6,187) | $ (2,846)
Fair Value | 32,084,932 |  | 39,804,617 | [1] |  |  |
Accrued interest receivable | 370,600 |  | 425,400 |  |  |  |
U.S. Government and agencies |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 172,650 |  | 173,638 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized gains | 7 |  | 70 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | (9,772) |  | (4,637) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  | 0 |  |  |  |
Fair Value | 162,885 |  | 169,071 |  |  |  |
States, municipalities and territories |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 3,198,091 |  | 4,356,251 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized gains | 5,049 |  | 41,565 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | (638,470) |  | (574,834) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 | 0 | 0 |  | 0 | (1,834) | (2,776)
Fair Value | 2,564,670 |  | 3,822,982 |  |  |  |
Foreign corporate securities and foreign governments |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 535,008 |  | 748,770 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized gains | 37 |  | 11,661 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | (106,818) |  | (83,579) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  | 0 |  |  |  |
Fair Value | 428,227 |  | 676,852 |  |  |  |
Corporate securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 23,271,192 |  | 27,706,440 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized gains | 45,571 |  | 146,065 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | (4,102,472) |  | (3,687,370) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | (2,911) | (3,132) | (3,214) |  | (3,214) | (3,743) | 0
Fair Value | 19,211,380 |  | 24,161,921 |  |  |  |
Residential mortgage backed securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 1,501,200 |  | 1,492,242 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized gains | 5,030 |  | 11,870 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | (163,149) |  | (126,368) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | (97) | (67) | (133) |  | (1,706) | (610) | (70)
Fair Value | 1,342,984 |  | 1,377,611 |  |  |  |
Commercial Mortgage-Backed Securities [Member] |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 3,520,832 |  | 4,098,755 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized gains | 443 |  | 493 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | (538,245) |  | (411,770) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  | 0 |  |  |  |
Fair Value | 2,983,030 |  | 3,687,478 |  |  |  |
Other asset backed securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 5,614,577 |  | 6,289,923 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized gains | 21,760 |  | 14,068 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | (243,971) |  | (395,289) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | (610) | $ (947) | 0 |  | $ 0 | $ 0 | $ 0
Fair Value | $ 5,391,756 |  | $ 5,908,702 |  |  |  |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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