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Mortgage Loans on Real Estate Financing Receivables, Troubled Debt Restructurings (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
loans
Dec. 31, 2011
loans
Financing Receivable, Modifications [Line Items]    
Number of Troubled Debt Restructurings During Period 24 25
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 68,050 $ 68,641
Allowance for Notes, Loans and Financing Receivable (10,969) (10,360)
Financing Receivable, Modifications, Post-Modification Recorded Investment 57,081 58,281
Troubled Debt Restructurings, East North Central Region [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of Troubled Debt Restructurings During Period 1  
Financing Receivable, Modifications, Pre-Modification Recorded Investment 2,232  
Allowance for Notes, Loans and Financing Receivable (467)  
Financing Receivable, Modifications, Post-Modification Recorded Investment 1,765  
Troubled Debt Restructurings, West North Central Region [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of Troubled Debt Restructurings During Period 3 1
Financing Receivable, Modifications, Pre-Modification Recorded Investment 9,466 1,937
Allowance for Notes, Loans and Financing Receivable (2,328) (269)
Financing Receivable, Modifications, Post-Modification Recorded Investment 7,138 1,668
Troubled Debt Restructurings, South Atlantic Region [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of Troubled Debt Restructurings During Period 9 11
Financing Receivable, Modifications, Pre-Modification Recorded Investment 23,358 28,676
Allowance for Notes, Loans and Financing Receivable (5,047) (6,339)
Financing Receivable, Modifications, Post-Modification Recorded Investment 18,311 22,337
Troubled Debt Restructurings, Mountain Region [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of Troubled Debt Restructurings During Period 10 10
Financing Receivable, Modifications, Pre-Modification Recorded Investment 28,786 29,539
Allowance for Notes, Loans and Financing Receivable (1,702) (1,637)
Financing Receivable, Modifications, Post-Modification Recorded Investment 27,084 27,902
Troubled Debt Restructurings, East Region [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of Troubled Debt Restructurings During Period 1 3
Financing Receivable, Modifications, Pre-Modification Recorded Investment 4,208 8,489
Allowance for Notes, Loans and Financing Receivable (1,425) (2,115)
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 2,783 $ 6,374