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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,337,397	$ 1,162,919
Allowance for Expected Credit Losses	(558)	(566)	$ (920)
Gross Unrealized Gains	8,640	2,115
Gross Unrealized Losses	(68,747)	(100,138)
Fair Value	1,276,732	1,064,330
U.S. government obligations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,209	23,886
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	226	49
Gross Unrealized Losses	(332)	(677)
Fair Value	20,103	23,258
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	905,947	779,177
Allowance for Expected Credit Losses	(459)	(469)
Gross Unrealized Gains	5,671	1,097
Gross Unrealized Losses	(41,896)	(64,091)
Fair Value	869,263	715,714
Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	385,871	334,460
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	2,708	969
Gross Unrealized Losses	(24,830)	(32,283)
Fair Value	363,749	303,146
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,891	15,916
Allowance for Expected Credit Losses	(1)	(4)
Gross Unrealized Gains	10	0
Gross Unrealized Losses	(1,282)	(1,873)
Fair Value	14,618	14,039
Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,479	9,480
Allowance for Expected Credit Losses	(98)	(93)	$ (189)
Gross Unrealized Gains	25	0
Gross Unrealized Losses	(407)	(1,214)
Fair Value	$ 8,999	$ 8,173

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