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Mortgage Loans on Real Estate (Schedule of Financing Receivables Past Due) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Mortgage Loans on Real Estate [Abstract]    
30 - 59 days $ 0 $ 0
60 to 89 days 0 0
90 days and over 0 0
Total past due 0 0
Current 2,454,418 2,451,760
Collateral dependent receivables 16,038 5,961
Principal outstanding $ 2,470,456 $ 2,457,721