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Mortgage Loans on Real Estate (Schedule of Impaired Financing Receivables) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |
Mortgage loans with an allowance, recorded investment | $ 26,524 |  | $ 30,171
Mortgage loans with no related allowance, recorded investment | 4,353 |  | 3,264
Impaired mortgage loans, recorded investment | 30,877 |  | 33,435
Mortgage loans with an allowance, unpaid principal balance | 42,986 |  | 47,018
Mortgage loans with no related allowance, unpaid principal balance | 4,353 |  | 3,264
Impaired mortgage loans, unpaid principal balance | 47,339 |  | 50,282
Mortgage loans with an allowance, related allowance | (16,462) |  | (16,847)
Mortgage loans with an allowance, average recorded investment | 29,884 | 28,384 |
Mortgage loans with no related allowance, average recorded investment | 3,456 | 20,505 |
Impaired mortgage loans, average recorded investment | 33,340 | 48,889 |
Mortgage loans with an allowance, interest income recognized | 508 | 331 |
Mortgage loans with no related allowance, interest income recognized | 351 | 284 |
Impaired mortgage loans, interest income reoognized | $ 859 | $ 615 |

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