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Investments (Components of 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, operating, net | $ 2,453,929 | $ 2,101,892 | $ 2,214,550
Less: investment expenses | (146,466) | (64,417) | (32,472)
Net investment income | 2,307,463 | 2,037,475 | 2,182,078
Fixed Maturity Securities, Available For Sale |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income, operating, net | 1,849,915 | 1,772,675 | 2,035,762
Real estate investments |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income, operating, net | 40,243 | 14,138 | 0
Mortgage loans on real estate |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income, operating, net | 301,118 | 215,138 | 170,749
Cash and Cash Equivalents |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income, operating, net | 24,985 | 3,385 | 4,871
Limited partnerships and limited liability companies |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income, operating, net | 188,131 | 67,157 | (12,204)
Other investments |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income, operating, net | $ 49,537 | $ 29,399 | $ 15,372

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- Definition Amount, after 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://www.xbrl.org/2003/role/disclosureRef -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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