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Liability for Unpaid Losses and Loss Adjustment Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]        
Current Year Claims and Claims Adjustment Expense $ 615,102 $ 466,359 $ 404,271  
Prior Year Claims and Claims Adjustment Expense (6,786) 33,134 4,318  
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 608,316 499,493 408,589  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year 320,389 275,488 283,821  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years 150,749 129,296 117,994  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid 471,138 404,784 401,815  
Liability for Unpaid Claims and Claims Adjustment Expense, Net 415,220 278,042 183,333 $ 176,559
Reinsurance Recoverable on Unpaid Losses and LAE       305,673
Unpaid losses and loss adjustment expenses 1,089,966 760,357 661,203 $ 482,232
Liability for Unpaid Claims and Claims Adjustment Expense, Reported Claims, Amount 392,717 300,858 270,601  
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount 697,249 459,499 390,602  
Reinsurance Recoverables on Unpaid Losses $ 674,746 $ 482,315 $ 477,870