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Summary Of Significant Accounting Policies (Reconciliation of Impact of Adopting ASU 2018-12 on AOCI, Transition Date) (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings | $ 11,353,101,000 | $ 9,832,804,000 |  |
Cumulative effect of changes in discount rate assumptions | (85,114,000) | (113,395,000) | $ 76,319,000 |
Life and annuity benefits | 649,054,000 | 650,721,000 |  |
Deferred tax liability, net | 1,170,399,000 | 859,559,000 |  |
Effect on accumulated other comprehensive income (loss), net of tax | $ (478,210,000) | $ (767,494,000) |  |
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings |  |  |  | $ 0
Reverse reserve deficiency adjustment related to unrealized gains on underlying investment portfolio of available-for-sale securities |  |  |  | 119,548,000
Cumulative effect of changes in discount rate assumptions |  |  |  | (138,865,000)
Life and annuity benefits |  |  |  | (19,317,000)
Deferred tax liability, net |  |  |  | 4,058,000
Effect on accumulated other comprehensive income (loss), net of tax |  |  |  | $ (15,259,000)

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