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Mortgage Loans on Real Estate (Impaired Financing Receivables) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Financing Receivable, Impaired [Line Items] |  |  |
Mortgage loans with an allowance, recorded investment | $ 30,171 | $ 29,976 | $ 44,034
Mortgage loans with no related allowance, recorded investment | 3,264 | 27,765 | 63,023
Impaired mortgage loans, recorded investment | 33,435 | 57,741 | 107,057
Mortgage loans with an allowance, unpaid principal balance | 47,018 | 53,110 | 67,698
Mortgage loans with no related allowance, unpaid principal balance | 3,264 | 27,765 | 63,023
Impaired mortgage loans, unpaid principal balance | 50,282 | 80,875 | 130,721
Mortgage loans with an allowance, related allowance | (16,847) | (23,134) | (23,664)
Mortgage loans with an allowance, average recorded investment | 33,772 | 37,480 | 53,617
Mortgage loans with no related allowance, average recorded investment | 3,264 | 27,696 | 60,974
Impaired mortgage loans, average recorded investment | 37,036 | 65,176 | 114,591
Mortgage loans with an allowance, interest income recognized | 2,094 | 1,946 | 3,284
Mortgage loans with no related allowance, interest income recognized | 138 | 1,664 | 3,509
Impaired mortgage loans, interest income recognized | $ 2,232 | $ 3,610 | $ 6,793

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