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Investments - Schedule of Fair Values and Gross Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 3,078,294	$ 2,876,343
Gross Unrealized, Gains	32,775	5,820
Gross Unrealized, Losses	(95,509)	(158,622)
Fair Value	3,015,560	2,723,541
U.S. Treasury securities and obligations of U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	100,950	115,342
Gross Unrealized, Gains	2,710	1,207
Gross Unrealized, Losses	(165)	(489)
Fair Value	103,495	116,060
Municipal debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	658,725	684,523
Gross Unrealized, Gains	2,603	589
Gross Unrealized, Losses	(30,964)	(49,867)
Fair Value	630,364	635,245
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,148,007	1,949,800
Gross Unrealized, Gains	27,454	3,981
Gross Unrealized, Losses	(61,582)	(106,141)
Fair Value	2,113,879	1,847,640
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	52,559	44,104
Gross Unrealized, Gains	0	1
Gross Unrealized, Losses	(2,796)	(2,125)
Fair Value	49,763	41,980
Total bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,960,241	2,793,769
Gross Unrealized, Gains	32,767	5,778
Gross Unrealized, Losses	(95,507)	(158,622)
Fair Value	2,897,501	2,640,925
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	118,053	82,574
Gross Unrealized, Gains	8	42
Gross Unrealized, Losses	(2)	0
Fair Value	$ 118,059	$ 82,616

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