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Summary of Significant Accounting Policies (Reconciliation of Impact of Adopting ASU 2018-12 on OCI, Prior Period) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Change in discount rate for life and annuity benefits, net of taxes $ (22,343) $ 149,874 $ 49,411
Increase (decrease) in other comprehensive loss, net of taxes $ 289,338 (989,485) (347,111)
Effect of Modified Retrospective Application Accounting Standards Update 2018-12      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Reverse benefit included in change in net unrealized gains (losses) on available-for-sale-investments, net of taxes, related to reversal of previously recognized reserve deficiency adjustment   (44,682) (49,761)
Change in discount rate for life and annuity benefits, net of taxes   149,874 49,411
Increase (decrease) in other comprehensive loss, net of taxes   $ 105,192 $ (350)