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Mortgage Loans on Real Estate (Schedule of Financing Receivables Past Due) (Details) - Commercial Real Estate Portfolio Segment - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Commercial mortgage loans, past due | $ 0 | $ 0
Commercial mortgage loans, current | 3,684,149 | 3,457,972
Commercial mortgage loans, collateral dependent receivables | 4,252 | 0
Amortized cost | 3,688,401 | 3,457,972
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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