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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, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Mortgage loans with an allowance, recorded investment | $ 16,626 |  | $ 16,626 |  | $ 16,783
Mortgage loans with no related allowance, recorded investment | 13,396 |  | 13,396 |  | 2,656
Impaired mortgage loans, recorded investment | 30,022 |  | 30,022 |  | 19,439
Mortgage loans with an allowance, unpaid principal balance | 27,244 |  | 27,244 |  | 29,116
Mortgage loans with no related allowance, unpaid principal balance | 13,396 |  | 13,396 |  | 2,656
Impaired mortgage loans, unpaid principal balance | 40,640 |  | 40,640 |  | 31,772
Mortgage loans with an allowance, related allowance | (10,618) |  | (10,618) |  | $ (12,333)
Mortgage loans with an allowance, average recorded investment | 17,336 | $ 22,157 | 17,649 | $ 23,580 |
Mortgage loans with no related allowance, average recorded investment | 13,414 | 2,656 | 13,432 | 2,656 |
Impaired mortgage loans, average recorded investment | 30,750 | 24,813 | 31,081 | 26,236 |
Mortgage loans with an allowance, interest income recognized | 44 | 539 | 866 | 1,696 |
Mortgage loans with no related allowance, interest income recognized | 176 | 0 | 595 | 0 |
Impaired mortgage loans, interest income reoognized | $ 220 | $ 539 | $ 1,461 | $ 1,696 |

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