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Mortgage Loans on Real Estate (Schedule of Financing Receivables Past Due) (Details) (Commercial Real Estate Portfolio Segment [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Commercial Real Estate Portfolio Segment [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30 - 59 days $ 0 $ 0
60 to 89 days 0 0
90 days and over 0 0
Total past due 0 0
Current 2,619,515 2,624,163
Collateral dependent receivables 6,048 34,720
Total financing receivables $ 2,625,563 $ 2,658,883