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Mortgage Loans on Real Estate (Schedule of Financing Receivables Past Due) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
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 2,599,152 2,599,524
Collateral dependent receivables 11,228 8,174
Principal outstanding $ 2,610,380 $ 2,607,698