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Liability for Unpaid Losses and Loss Adjustment Expenses - Summary of Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance $ 2,663,923        
All outstanding liabilities before 2018, net of reinsurance (9,542)        
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 221,171        
Accident Year 2018          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance 353,566 $ 353,506 $ 348,225 $ 327,310 $ 253,008
Accident Year 2019          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance 480,967 463,924 446,997 $ 335,991  
Accident Year 2020          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance 645,553 604,201 $ 452,560    
Accident Year 2021          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance 665,008 $ 461,709      
Accident Year 2022          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance $ 518,829