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Mortgage Loans on Real Estate (Schedule of Impaired Financing Receivables) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Mortgage loans with an allowance, recorded investment | $ 3,356 |  | $ 3,356 |  | $ 13,435
Mortgage loans with no related allowance, recorded investment | 1,621 |  | 1,621 |  | 8,859
Impaired mortgage loans, recorded investment | 4,977 |  | 4,977 |  | 22,294
Mortgage loans with an allowance, unpaid principal balance | 4,683 |  | 4,683 |  | 21,277
Mortgage loans with no related allowance, unpaid principal balance | 1,621 |  | 1,621 |  | 8,859
Impaired mortgage loans, unpaid principal balance | 6,304 |  | 6,304 |  | 30,136
Mortgage loans with an allowance, related allowance | (1,327) |  | (1,327) |  | $ (7,842)
Mortgage loans with an allowance, average recorded investment | 3,378 | $ 17,336 | 3,420 | $ 17,649 |
Mortgage loans with no related allowance, average recorded investment | 1,634 | 13,414 | 1,680 | 13,432 |
Impaired mortgage loans, average recorded investment | 5,012 | 30,750 | 5,100 | 31,081 |
Mortgage loans with an allowance, interest income recognized | 75 | 44 | 226 | 866 |
Mortgage loans with no related allowance, interest income recognized | 25 | 176 | 75 | 595 |
Impaired mortgage loans, interest income reoognized | $ 100 | $ 220 | $ 301 | $ 1,461 |

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