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Investment Information - Net investment Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Net investment income: |  |  |  |
Gross investment income |  | $ 567,322 | $ 477,123 | $ 608,823
Investment expenses |  | (70,775) | (88,005) | (89,215)
Net investment income |  | 496,547 | 389,118 | 519,608
Fixed maturities |  |  |  |
Net investment income: |  |  |  |
Gross investment income |  | 468,659 | 330,061 | 412,481
Term loan investments |  |  |  |
Net investment income: |  |  |  |
Gross investment income |  | 2,038 | 34,843 | 84,149
Equity securities |  |  |  |
Net investment income: |  |  |  |
Gross investment income |  | 22,497 | 42,396 | 28,958
Short-term investments |  |  |  |
Net investment income: |  |  |  |
Gross investment income |  | 29,519 | 6,928 | 10,840
Other |  |  |  |
Net investment income: |  |  |  |
Gross investment income | [1] | $ 44,609 | $ 62,895 | $ 72,395
[1] | Includes income distributions from investment funds and other items

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