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Investments - Schedule of Investments, Available-for-Sale Securities (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
Debt Securities, Available-for-Sale [Line Items]  
Amortized Cost $ 511,180
Gross Unrealized Gains 11,177
Gross Unrealized Losses (145)
Estimated Fair Value 522,212
Corporate  
Debt Securities, Available-for-Sale [Line Items]  
Amortized Cost 209,096
Gross Unrealized Gains 4,895
Gross Unrealized Losses (27)
Estimated Fair Value 213,964
U.S. Treasury  
Debt Securities, Available-for-Sale [Line Items]  
Amortized Cost 108,530
Gross Unrealized Gains 1,054
Gross Unrealized Losses (23)
Estimated Fair Value 109,561
States and municipalities  
Debt Securities, Available-for-Sale [Line Items]  
Amortized Cost 38,211
Gross Unrealized Gains 1,718
Gross Unrealized Losses 0
Estimated Fair Value 39,929
Foreign  
Debt Securities, Available-for-Sale [Line Items]  
Amortized Cost 18,632
Gross Unrealized Gains 56
Gross Unrealized Losses (54)
Estimated Fair Value 18,634
Asset-backed securities  
Debt Securities, Available-for-Sale [Line Items]  
Amortized Cost 25,126
Gross Unrealized Gains 650
Gross Unrealized Losses (9)
Estimated Fair Value 25,767
Mortgage-backed securities  
Debt Securities, Available-for-Sale [Line Items]  
Amortized Cost 111,585
Gross Unrealized Gains 2,804
Gross Unrealized Losses (32)
Estimated Fair Value $ 114,357