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Mortgage Loans on Real Estate Mortgage Loans by Credit Quality Indicator (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]    
Notes, Loans and Financing Receivable, Gross $ 2,600,000,000  
Financing Receivable, by Credit Quality Indicator [Domain]
   
Financing Receivable, Recorded Investment [Line Items]    
Mortgage Loans on Real Estate Performing 2,578,031,000 2,597,440,000
Mortgage Loans on Real Estate In Workout 28,326,000 26,723,000
Mortgage Loans on Real Estate Collateral Dependent 19,380,000 34,720,000
Notes, Loans and Financing Receivable, Gross 2,625,737,000 2,658,883,000
Commercial Real Estate Portfolio Segment [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status 19,400,000 34,700,000
Notes, Loans and Financing Receivable, Gross $ 2,625,737,000 $ 2,658,883,000