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Reinsurance - LPT (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 16, 2020
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2020
Effects of Reinsurance [Line Items]        
Ceded premiums written   $ 69,871   $ 75,084
Reinsurance Recoverables   494,400    
LPT        
Effects of Reinsurance [Line Items]        
Pre-tax loss     $ 21,700  
Policyholder benefits and claims incurred, ceded $ 240,000      
Ceded premiums written 92,600      
Payments for Deposits with Other Institutions 96,700      
Reinsurance contract, ultimate incurred losses   182,800    
Reinsurance contract in excess of the first layer   6,700    
Reinsurance Recoverables   $ 54,700    
First Layer Of Reinsurance By DARAG Bermuda [Member] | LPT        
Effects of Reinsurance [Line Items]        
Reinsurance Retention Policy, Excess Retention, Amount Reinsured 151,200      
Reinsurance Retention Policy, Amount Retained 24,900      
Second Layer Of Reinsurance By DARAG Bermuda [Member] | LPT        
Effects of Reinsurance [Line Items]        
Reinsurance Retention Policy, Amount Retained 27,800      
Top Layer Of Reinsurance By DARAG Guernsey [Member] | LPT        
Effects of Reinsurance [Line Items]        
Reinsurance Retention Policy, Amount Retained $ 36,100