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Subsequent Events (Details) - USD ($)
$ in Thousands
 2 Months Ended 3 Months Ended
May 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Mar. 31, 2019
Subsequent Event [Line Items]        
Other insurance expenses     $ 95,346 $ 85,079
Net investment income     (55,967) (50,618)
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Policyholder's Premium Credit 15.00%      
Other insurance expenses   $ 20,000    
Alternative Investments [Member]        
Subsequent Event [Line Items]        
Net investment income     $ (6,300) $ (600)
Minimum [Member] | Alternative Investments [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Net investment income   (15,000)    
Maximum [Member] | Alternative Investments [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Net investment income   (20,000)    
Property Insurance [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims   $ 35,000