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Mortgage Loans on Real Estate (Schedule of Impaired Financing Receivables) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |
Mortgage loans with an allowance, recorded investment | $ 3,268 |  | $ 3,313
Mortgage loans with no related allowance, recorded investment | 1,554 |  | 1,591
Impaired mortgage loans, recorded investment | 4,822 |  | 4,904
Mortgage loans with an allowance, unpaid principal balance | 4,595 |  | 4,640
Mortgage loans with no related allowance, unpaid principal balance | 1,554 |  | 1,591
Impaired mortgage loans, unpaid principal balance | 6,149 |  | 6,231
Mortgage loans with an allowance, related allowance | (1,327) |  | $ (1,327)
Mortgage loans with an allowance, average recorded investment | 3,291 | $ 13,999 |
Mortgage loans with no related allowance, average recorded investment | 1,572 | 1,709 |
Impaired mortgage loans, average recorded investment | 4,863 | 15,708 |
Mortgage loans with an allowance, interest income recognized | 72 | 264 |
Mortgage loans with no related allowance, interest income recognized | 23 | 26 |
Impaired mortgage loans, interest income reoognized | $ 95 | $ 290 |

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