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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