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Mortgage Loans on Real Estate Allowance for Loan Losses Table (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Financing Receivable, Allowance for Credit Losses $ (10,969) $ (10,360)  
Loans Receivable, Gross, Commercial, Real Estate 2,600,000 2,800,000  
Allowance for Notes Receivable [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Financing Receivable, Allowance for Credit Losses (23,664) (13,224) (5,266)
Financing Receivable, Allowance for Credit Losses, Charge-offs 15,562 14,030 4,267
Financing Receivable, Allowance for Credit Losses, Recoveries 0 0 0
Financing Receivable, Allowance for Credit Losses, Provisions (15,032) (24,470) (12,225)
Financing Receivable, Allowance for Credit Losses (23,134) (23,664) (13,224)
Allowance for Loan and Lease Losses [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Financing Receivable, Allowance for Credit Losses (9,300) (3,000) 0
Financing Receivable, Allowance for Credit Losses, Charge-offs 0 0 0
Financing Receivable, Allowance for Credit Losses, Recoveries 0 0 0
Financing Receivable, Allowance for Credit Losses, Provisions (1,800) (6,300) (3,000)
Financing Receivable, Allowance for Credit Losses (11,100) (9,300) (3,000)
Commercial Real Estate Portfolio Segment [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Financing Receivable, Individually Evaluated for Impairment 53,110 67,698 31,027
Financing Receivable, Collectively Evaluated for Impairment 2,605,723 2,788,313 2,583,838
Loans Receivable, Gross, Commercial, Real Estate $ 2,658,833 $ 2,856,011 $ 2,614,865