XML 45 R36.htm IDEA: XBRL DOCUMENT v3.23.3
Summary of Significant Accounting Policies (Reconciliation of Impact of Adopting ASU 2018-12 on AOCI, Previously Presented Balance Sheets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounting Policies [Abstract]      
Life and annuity benefits $ 600,256 $ 650,721  
Accumulated other comprehensive income (loss), net of tax (890,833) (767,494)  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Life and annuity benefits 600,256 650,721  
Accumulated other comprehensive loss $ (890,833) (767,494)  
Effect of Modified Retrospective Application Accounting Standards Update 2018-12      
Accounting Policies [Abstract]      
Life and annuity benefits   113,396 $ (19,759)
Deferred tax liabilities, net   (23,813) 4,149
Accumulated other comprehensive income (loss), net of tax   89,583 (15,610)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Life and annuity benefits   113,396 (19,759)
Deferred tax liabilities, net   (23,813) 4,149
Accumulated other comprehensive loss   $ 89,583 $ (15,610)