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Liability for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense        
Unpaid losses and loss adjustment expenses $ 1,217,791 $ 711,042 $ 1,089,966 $ 760,357
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 821,364 423,609 674,746 482,315
Liability for Unpaid Claims and Claims Adjustment Expense, Net 396,427 287,433 $ 415,220 $ 278,042
Current Year Claims and Claims Adjustment Expense 86,012 103,966    
Prior Year Claims and Claims Adjustment Expense 29,769 1,129    
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 115,781 102,837    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year 30,597 30,935    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years 103,977 62,511    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid 134,574 93,446    
Liability for Unpaid Claims and Claims Adjustment Expense, Reported Claims, Amount 432,537 294,679    
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount $ 785,254 $ 416,363