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Reinsurance Recoverable and Prepaid Reinsurance Premiums - Schedule of the Components of Reinsurance Receivables and Prepaid Reinsurance Premiums (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Effects of Reinsurance [Line Items]    
Total ceded claim reserves recoverable $ 488,488 $ 448,287
Other reinsurance settlements recoverable 422,560 505,599
Total reinsurance recoverable 911,048 953,886
Prepaid reinsurance premiums 907,758 900,524
Life insurance    
Effects of Reinsurance [Line Items]    
Total ceded claim reserves recoverable 4,239 4,733
Prepaid reinsurance premiums 73,033 74,815
Accident and health insurance    
Effects of Reinsurance [Line Items]    
Total ceded claim reserves recoverable 22,977 22,660
Prepaid reinsurance premiums 73,460 76,440
Property and liability insurance    
Effects of Reinsurance [Line Items]    
Total ceded claim reserves recoverable 461,272 420,894
Prepaid reinsurance premiums $ 761,265 $ 749,269