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Investments - Investment Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investments [Line Items]
Total investment income	$ 288,617	$ 241,131	$ 174,326
Less: investment expense	(8,628)	(6,501)	(5,970)
Net investment income	279,989	234,630	168,356
Fixed maturity securities
Investments [Line Items]
Total investment income	207,798	173,167	127,336
Equity securities
Investments [Line Items]
Total investment income	43,107	44,223	43,495
Short-term investments
Investments [Line Items]
Total investment income	$ 37,712	$ 23,741	$ 3,495

X

- Definition

Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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