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Loss Reserves - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Claims Development [Line Items]      
Losses incurred related to current accident year $ 275,418 $ 219,461 $ 141,225
Prior year claims and claims unfavorable (favorable) adjustment (248,214) (313,652) (15,822)
Loss incurred related to prior accident years, favorable (unfavorable) adjustments 241,000 314,000 22,000
Scenario One      
Claims Development [Line Items]      
Prior year claims and claims unfavorable (favorable) adjustment (248,200) (313,700) (15,800)
Scenario One      
Claims Development [Line Items]      
Losses incurred related to current accident year $ 275,400 219,500 $ 141,200
Scenario Two      
Claims Development [Line Items]      
Losses incurred related to current accident year   $ 46,000