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Mortgage Loans on Real Estate (Schedule of Impaired Financing Receivables) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |
Mortgage loans with an allowance, recorded investment | $ 13,305 |  | $ 13,435
Mortgage loans with no related allowance, recorded investment | 1,678 |  | 8,859
Impaired mortgage loans, recorded investment | 14,983 |  | 22,294
Mortgage loans with an allowance, unpaid principal balance | 19,055 |  | 21,277
Mortgage loans with no related allowance, unpaid principal balance | 1,678 |  | 8,859
Impaired mortgage loans, unpaid principal balance | 20,733 |  | 30,136
Mortgage loans with an allowance, related allowance | (5,750) |  | $ (7,842)
Mortgage loans with an allowance, average recorded investment | 13,999 | $ 19,158 |
Mortgage loans with no related allowance, average recorded investment | 1,709 | 13,107 |
Impaired mortgage loans, average recorded investment | 15,708 | 32,265 |
Mortgage loans with an allowance, interest income recognized | 264 | 451 |
Mortgage loans with no related allowance, interest income recognized | 26 | 159 |
Impaired mortgage loans, interest income reoognized | $ 290 | $ 610 |

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