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Mortgage Loans on Real Estate Mortgage Loans by Credit Quality Indicator (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]    
Notes, Loans and Financing Receivable, Gross $ 2,700,000,000 $ 2,800,000,000
Commercial Real Estate Portfolio Segment [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status 36,000,000 45,500,000
Mortgage Loans on Real Estate Collateral Dependent 36,019,000 38,923,000
Commercial Real Estate Portfolio Segment [Member] | Financing Receivable, by Credit Quality Indicator [Domain]
   
Financing Receivable, Recorded Investment [Line Items]    
Mortgage Loans on Real Estate Performing 2,682,471,000 2,743,068,000
Mortgage Loans on Real Estate In Workout 44,371,000 67,425,000
Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans 0 6,595,000
Mortgage Loans on Real Estate Collateral Dependent 36,019,000 38,923,000
Notes, Loans and Financing Receivable, Gross $ 2,762,861,000 $ 2,856,011,000