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Summary of Significant Accounting Policies (Reconciliation of Impact of Adopting ASU 2018-12 on AOCI, Previously Presented Balance Sheets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Life and annuity benefits $ 649,054 $ 650,721  
Deferred tax liability, net 1,170,399 859,559  
Effect on accumulated other comprehensive income (loss), net of tax $ (478,210) (767,494)  
Effect of Modified Retrospective Application Accounting Standards Update 2018-12      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Life and annuity benefits   113,396 $ (19,759)
Deferred tax liability, net   (23,813) 4,149
Effect on accumulated other comprehensive income (loss), net of tax   $ 89,583 $ (15,610)