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Mortgage Loans on Real Estate Schedule of Financing Receivables Past Due (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Commercial Real Estate Portfolio Segment [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due $ 0 $ 0
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 0
Financing Receivable, Recorded Investment, Past Due 0 0
Financing Receivable, Recorded Investment, Current 2,606,357,000 2,624,163,000
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, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status $ 19,400,000 $ 34,700,000