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Statutory Information - Summary of Amounts Disclosed Under Statutory Accounting Practices (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Statutory Capital [Abstract]    
Statutory net income $ 54,612 $ 96,018
Statutory policyholders' surplus 992,075 1,319,633
Contingency reserve $ 4,803,752 $ 4,263,599