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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Valuation allowance | $ (38,135) | $ (36,972) |  | $ (24,024)
Mortgage loans, carrying value | 7,537,594 | 6,949,027 | [1] |
Commercial Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Principal outstanding | 3,550,204 | 3,560,903 |  |
Deferred fees and costs, net | (2,494) | (6,345) |  |
Unamortized discounts and premiums, net | (2,711) | 0 |  |
Mortgage loans, amortized cost | 3,544,999 | 3,554,558 |  |
Valuation allowance | (17,902) | (22,428) |  | (17,926)
Mortgage loans, carrying value | 3,527,097 | 3,532,130 |  |
Agricultural Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Principal outstanding | 581,287 | 567,630 |  |
Deferred fees and costs, net | (1,654) | (1,667) |  |
Mortgage loans, amortized cost | 579,633 | 565,963 |  |
Valuation allowance | (2,590) | (1,021) |  | (519)
Mortgage loans, carrying value | 577,043 | 564,942 |  |
Residential Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Principal outstanding | 3,384,737 | 2,807,652 |  |
Deferred fees and costs, net | 558 | 1,909 |  |
Unamortized discounts and premiums, net | 65,802 | 55,917 |  |
Mortgage loans, amortized cost | 3,451,097 | 2,865,478 |  |
Valuation allowance | (17,643) | (13,523) |  | $ (5,579)
Mortgage loans, carrying value | $ 3,433,454 | $ 2,851,955 |  |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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