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Mortgage Loans on Real Estate Schedule of Mortgage Loans on Real Estate, Amortized Cost and Carrying Value (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]    
Loans Receivable, Gross, Commercial, Real Estate $ 2,600,000,000  
Allowance for Notes, Loans and Financing Receivable (11,098,000) (10,969,000)
Mortgage loans on real estate 2,591,897,000 2,623,940,000
Loans and Leases Receivable, Commercial, Loans in Process 73,000,000  
Commercial Real Estate Portfolio Segment [Member]
   
Mortgage Loans on Real Estate [Line Items]    
Loans Receivable, Gross, Commercial, Real Estate 2,625,737,000 2,658,883,000
Allowance for Notes, Loans and Financing Receivable 33,031,000 34,234,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Commercial (809,000) (709,000)
Mortgage loans on real estate $ 2,591,897,000 $ 2,623,940,000