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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |
Commercial mortgage loans, past due | $ 0 | $ 0 |
Commercial mortgage loans, current | 3,458,914 | 2,952,464 |
Commercial mortgage loans, collateral dependent receivables | 0 | 0 |
Principal outstanding | 3,458,914 | 2,952,464 | $ 2,674,315
30 to 59 Days |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Commercial mortgage loans, past due | 0 | 0 |
60 to 89 Days |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Commercial mortgage loans, past due | 0 | 0 |
90 Days and Over |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Commercial mortgage loans, past due | $ 0 | $ 0 |

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