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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | [1] | Dec. 31, 2019
--- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Valuation allowance | $ (19,279) | $ (20,089) | $ (17,779) | $ (9,179)
Mortgage loans, carrying value | 3,926,699 |  |  | 3,448,793
Commercial Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Principal outstanding | 3,778,317 |  |  | 3,458,914
Deferred fees and costs, net | (1,827) |  |  | (942)
Amortized cost | 3,776,490 |  |  | 3,457,972
Valuation allowance | (17,429) | (18,439) | (17,779) | (9,179)
Mortgage loans, carrying value | 3,759,061 |  |  | 3,448,793
Residential Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Principal outstanding | 171,934 |  |  | 0
Deferred fees and costs, net | 392 |  |  | 0
Unamortized discounts and premiums, net | (2,838) |  |  | 0
Amortized cost | 169,488 |  |  | 0
Valuation allowance | (1,850) | $ (1,650) | $ 0 | 0
Mortgage loans, carrying value | $ 167,638 |  |  | $ 0
[1] | (1) Upon adoption of authoritative guidance effective January 1, 2020, we updated our accounting policies and methodology for calculating the general loan loss allowance, resulting in an adjustment to our mortgage loan valuation allowance. See Note 1 for further details.

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