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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
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Accounting Policies [Abstract]        
Other Comprehensive Income (Loss), Net of Tax $ (130,983) $ (301,835) $ 26,762 $ (762,021)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Other Comprehensive Income (Loss), Net of Tax $ (130,983) (301,835) $ 26,762 (762,021)
Effect of Modified Retrospective Application Accounting Standards Update 2018-12        
Accounting Policies [Abstract]        
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   0   (44,682)
Change in discount rate for life and annuity benefits, net of taxes   63,198   123,891
Other Comprehensive Income (Loss), Net of Tax   63,198   79,209
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   0   (44,682)
Change in discount rate for life and annuity benefits, net of taxes   63,198   123,891
Other Comprehensive Income (Loss), Net of Tax   $ 63,198   $ 79,209