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Fair Values of Financial Instruments (Reconciliation of Beginning and Ending Balances of Level 3 Assets and Liabilities) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
States, municipalities and territories |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 0 | $ 0
Purchases and sales, net | 0 | 0
Transfers in | 203,757 | 0
Transfers out | (2,001) | 0
Included in net income | 0 | 0
Included in other comprehensive income (loss) | 20,461 | 0
Ending balance | 222,217 | 0
Corporate securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 402,348 | 0
Purchases and sales, net | (45,187) | 2,233
Transfers in | 82,866 | 391,702
Transfers out | (172,174) | 0
Included in net income | 0 | 0
Included in other comprehensive income (loss) | (12,416) | 8,413
Ending balance | 255,437 | 402,348
Other asset backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 442,918 | 0
Purchases and sales, net | 1,071,824 | 296,800
Transfers in | 160,160 | 153,669
Transfers out | (20,817) | 0
Included in net income | 0 | 0
Included in other comprehensive income (loss) | (63,111) | (7,551)
Ending balance | 1,590,974 | 442,918
Other investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 0 | 6,349
Transfers in | 9,821 | 0
Transfers out | (23,244) | (3,867)
Included in net income | 0 | (2,482)
Included in other comprehensive income (loss) | 13,423 | 0
Ending balance | 0 | 0
Real estate investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 940,559 | 337,939
Purchases and sales, net | 313,235 | 602,298
Included in net income | (36,523) | 322
Ending balance | 1,217,271 | 940,559
Limited partnerships and limited liability companies |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 64,209 | 0
Purchases and sales, net | 99,963 | 57,574
Included in net income | (11,041) | 6,635
Ending balance | 153,131 | 64,209
Funds Withheld Liability - Embedded Derivative |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Beginning balance | (441,864) | 0
Transfers in | 0 | (441,864)
Change in fair value, net | 185,088 | 0
Ending balance | (256,776) | (441,864)
Fixed Index Annuities - Embedded Derivatives |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Beginning balance | 4,820,845 | 7,964,961
Premiums less benefits | (177,559) | (125,940)
Change in fair value, net | 538,608 | (2,561,676)
Reserve release related to in-force ceded reinsurance | 0 | (456,500)
Ending balance | $ 5,181,894 | $ 4,820,845

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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