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Mortgage Loans on Real Estate (Schedule of Impaired Financing Receivables) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Mortgage loans with an allowance, recorded investment | $ 4,724 |  | $ 4,724 |  | $ 3,313
Mortgage loans with no related allowance, recorded investment | 1,516 |  | 1,516 |  | 1,591
Impaired mortgage loans, recorded investment | 6,240 |  | 6,240 |  | 4,904
Mortgage loans with an allowance, unpaid principal balance | 6,773 |  | 6,773 |  | 4,640
Mortgage loans with no related allowance, unpaid principal balance | 1,516 |  | 1,516 |  | 1,591
Impaired mortgage loans, unpaid principal balance | 8,289 |  | 8,289 |  | 6,231
Mortgage loans with an allowance, related allowance | (2,049) |  | (2,049) |  | $ (1,327)
Mortgage loans with an allowance, average recorded investment | 5,107 | $ 6,921 | 5,135 | $ 7,166 |
Mortgage loans with no related allowance, average recorded investment | 1,535 | 4,737 | 1,553 | 4,793 |
Impaired mortgage loans, average recorded investment | 6,642 | 11,658 | 6,688 | 11,959 |
Mortgage loans with an allowance, interest income recognized | 104 | 164 | 207 | 329 |
Mortgage loans with no related allowance, interest income recognized | 23 | 74 | 46 | 150 |
Impaired mortgage loans, interest income reoognized | $ 127 | $ 238 | $ 253 | $ 479 |

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