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Mortgage Loans on Real Estate (Schedule of Impaired Financing Receivables) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Financing Receivable, Impaired [Line Items] |  |
Mortgage loans with an allowance, recorded investment | $ 29,937 | $ 29,976
Mortgage loans with no related allowance, recorded investment | 18,782 | 27,765
Impaired mortgage loans, recorded investment | 48,719 | 57,741
Mortgage loans with an allowance, unpaid principal balance | 50,055 | 53,110
Mortgage loans with no related allowance, unpaid principal balance | 18,782 | 27,765
Impaired mortgage loans, unpaid principal balance | 68,837 | 80,875
Mortgage loans with an allowance, related allowance | (20,118) | (23,134)
Mortgage loans with an allowance, average recorded investment | 32,897 | 37,480
Mortgage loans with no related allowance, average recorded investment | 18,976 | 27,696
Impaired mortgage loans, average recorded investment | 51,873 | 65,176
Mortgage loans with an allowance, interest income recognized | 2,082 | 1,946
Mortgage loans with no related allowance, interest income recognized | 799 | 1,664
Impaired mortgage loans, interest income reoognized | $ 2,881 | $ 3,610

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