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Summary of Significant Accounting Policies - Allowance for Credit Losses on Reinsurance Recoverables (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 0 $ 0 $ 91
Provision during the period for expected credit losses 12 0 (91)
Write-off amounts during the period 0 0 0
Recoveries during the period of amounts previously written off 0 0 0
Ending balance $ 12 $ 0 $ 0