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Statutory Information - Summary of Amounts Disclosed Under Statutory Accounting Practices (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Statutory Capital [Abstract]    
Statutory net income $ 117,667 $ 4,545
Statutory policyholders' surplus 1,442,614 1,249,803
Contingency reserve $ 3,850,021 $ 3,230,255