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Mortgage Loans on Real Estate Mortgage Loans on Real Estate, Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 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 | $ 76,008 | $ 68,641
Allowance for Notes, Loans and Financing Receivable | (13,343) | (10,360)
Financing Receivable, Modifications, Recorded Investment | 62,665 | 58,281
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, Recorded Investment | 2,783 | 6,374
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 | 32,222 | 29,539
Allowance for Notes, Loans and Financing Receivable | (2,193) | (1,637)
Financing Receivable, Modifications, Recorded Investment | 30,029 | 27,902
Troubled Debt Restructurings, South Atlantic Region [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Troubled Debt Restructurings During Period | 7 | 11
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 20,690 | 28,676
Allowance for Notes, Loans and Financing Receivable | (4,309) | (6,339)
Financing Receivable, Modifications, Recorded Investment | 16,381 | 22,337
Troubled Debt Restructurings, East North Central Region [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Troubled Debt Restructurings During Period | 4 |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 11,914 |
Allowance for Notes, Loans and Financing Receivable | (4,116) |
Financing Receivable, Modifications, Recorded Investment | 7,798 |
Troubled Debt Restructurings, West North Central Region [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Troubled Debt Restructurings During Period | 2 | 1
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 6,974 | 1,937
Allowance for Notes, Loans and Financing Receivable | (1,300) | (269)
Financing Receivable, Modifications, Recorded Investment | $ 5,674 | $ 1,668

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