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Reserve for Losses and Loss Adjustment Expenses - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 21 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Unusual Risk or Uncertainty [Line Items]            
Liability incurred for claims and claim adjustment expenses     $ 2,051 $ 3,139    
Prior year claims and claims adjustment expense     (226,152) (30,627)    
Benefit recorded in provision for losses $ 62,900   164,100      
Reserve for losses and LAE, for prior years 153,300   153,300 322,100    
Reserve for losses and LAE 209,973   $ 209,973 $ 421,872 $ 407,445 $ 374,941
COVID-19            
Unusual Risk or Uncertainty [Line Items]            
Reserve rate   4.00% 2.00%   7.00%  
Reserve for losses and LAE 70,800   $ 70,800      
Percent change used in calculation of expense     1.00%      
Effect of percentage point decrease on liability claim and claim expense adjustment expense $ 35,000   $ 35,000