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Investments - 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 [Line Items] |  |  |
Gross investment income | $ 202,524 | $ 154,956 | $ 160,633
Investment expenses | (6,866) | (7,047) | (6,596)
Net investment income | 195,658 | 147,909 | 154,037
Fixed-maturities available for sale |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 184,189 | 145,613 | 148,127
Equity securities |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 11,210 | 8,158 | 6,378
Mortgage Loans |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 39 | 0 | 0
Short-term investments |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 5,716 | 817 | 5,774
Other |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | $ 1,370 | $ 368 | $ 354

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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