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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

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