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Reinsurance Receivables - Schedule of the Components of Reinsurance Receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Effects of Reinsurance [Line Items]    
Prepaid reinsurance premiums $ 603,441 $ 560,195
Reinsurance receivables 827,199 728,009
Life insurance    
Effects of Reinsurance [Line Items]    
Prepaid reinsurance premiums 72,056 70,066
Ceded claim reserves 4,215 4,133
Accident and health insurance    
Effects of Reinsurance [Line Items]    
Prepaid reinsurance premiums 75,890 66,261
Ceded claim reserves 12,596 11,118
Property and liability insurance    
Effects of Reinsurance [Line Items]    
Prepaid reinsurance premiums 455,495 423,868
Ceded claim reserves 138,289 98,092
Total ceded claim reserves recoverable    
Effects of Reinsurance [Line Items]    
Ceded claim reserves 155,100 113,343
Other reinsurance settlements recoverable    
Effects of Reinsurance [Line Items]    
Other reinsurance settlements recoverable $ 68,658 $ 54,471