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Reserve for Losses and Loss Adjustment Expenses - Reconciliation of Reserve Balances for Losses and Loss Adjustment Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of the beginning and ending reserve balances for losses and loss adjustment expenses (LAE)        
Reserve for losses and LAE at beginning of period $ 407,445 $ 374,941    
Less: Reinsurance recoverables 19,335 24,907 $ 25,940 $ 19,061
Net reserve for losses and LAE at beginning of period 381,505 355,880    
Add provision for losses and LAE, net of reinsurance, occurring in:        
Current period 24,369 47,989    
Prior years (131,227) (15,667)    
Net incurred losses and LAE during the current period (106,858) 32,322    
Deduct payments for losses and LAE, net of reinsurance, occurring in:        
Current period 1 114    
Prior years 909 1,872    
Net loss and LAE payments during the current period 910 1,986    
Net reserve for losses and LAE at end of period 273,737 386,216    
Plus: Reinsurance recoverables 19,335 24,907 $ 25,940 $ 19,061
Reserve for losses and LAE at end of period $ 293,072 $ 411,123