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Investments - Investment Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Investments [Line Items] |  |  |
Total investment income | $ 241,131 | $ 174,326 | $ 136,124
Less: investment expense | (6,501) | (5,970) | (6,397)
Net investment income | 234,630 | 168,356 | 129,727
Fixed maturity securities |  |  |
Investments [Line Items] |  |  |
Total investment income | 173,167 | 127,336 | 100,001
Equity securities |  |  |
Investments [Line Items] |  |  |
Total investment income | 44,223 | 43,495 | 35,064
Short-term investments |  |  |
Investments [Line Items] |  |  |
Total investment income | $ 23,741 | $ 3,495 | $ 1,059

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- 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 45 -Paragraph 39 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480228/946-830-45-39 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + Details
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