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Liability for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense        
Unpaid losses and loss adjustment expenses $ 1,509,477 $ 1,082,126 $ 1,089,966 $ 760,357
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 1,153,799 701,715 674,746 482,315
Liability for Unpaid Claims and Claims Adjustment Expense, Net 355,678 380,411 $ 415,220 $ 278,042
Current Year Claims and Claims Adjustment Expense 305,270 429,347    
Prior Year Claims and Claims Adjustment Expense 31,344 6,165    
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 336,614 423,182    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year 152,415 195,728    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years 243,741 125,085    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid 396,156 320,813    
Liability for Unpaid Claims and Claims Adjustment Expense, Reported Claims, Amount 499,311 361,672    
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount $ 1,010,166 $ 720,454