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Investments - Schedule of Net Realized and Unrealized Investment Gains and (Losses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Gain (Loss) on Securities [Line Items]        
Gross gains on sales $ 8,311 $ 4,159 $ 12,192 $ 10,681
Gross losses on sales (8,886) (2,012) (13,663) (5,228)
Net realized gains (losses) on disposals (575) 2,147 (1,471) 5,453
Net unrealized gains (losses) on equity securities 7,802 2,407 12,492 3,006
Losses on securities for which we have the intent to sell 0 (752) (759) (1,248)
Other realized gains (losses) 0 (602) 0 (602)
Net realized and unrealized investment gains (losses) 8,057 5,389 12,458 5,051
Debt Securities, Available-For-Sale        
Gain (Loss) on Securities [Line Items]        
Net credit loss benefit (expense) 829 2,191 2,345 (1,692)
CMLs        
Gain (Loss) on Securities [Line Items]        
Net credit loss benefit (expense) $ 1 $ (2) $ (149) $ 134