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Basis of Presentation and Significant Accounting Policies - Investment Contract and Life Policy Reserves (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Investment contract reserves $ 4,847,649 $ 4,675,774
Policy reserves 1,597,674 1,558,678
Total $ 6,445,323 $ 6,234,452