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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
9 Months Ended
Sep. 30, 2012
days
Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Mortgage Loans on Real Estate, Past Due Period for Considering Loans as Delinquent 60  
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due $ 0 $ 3,378
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due 0 0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due 0 6,595
Financing Receivable, Recorded Investment, Past Due 0 9,973
Financing Receivable, Recorded Investment, Current 2,726,842 2,807,115
Mortgage Loans on Real Estate Collateral Dependent 36,019 38,923
Notes, Loans and Financing Receivable, Gross $ 2,762,861 $ 2,856,011
Financing Receivables, Minimum Number of Days Past Due for Ceasing Accrual of Interest 90