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Commitments and Contingencies (Narrative) (Details) (USD $) | 3 Months Ended | 24 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2007 | Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |
Total Mortgage Loans Originated |  | $ 39,500,000,000 |  |  |
Percentage of loan origination repurchase requests in which Company is able to cure or refute the claim | 60.00% |  |  |  |
Actual Loss Severities Percentage on Mortgage Repurchase Requests | 50.00% |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum product warranty in years | 10 years |  |  |  |
Aggregate Principal Balance of Community Development District Obligations Repurchased | 0 |  |  |  |
Letters of Credit Outstanding, Amount | 172,700,000 |  | 179,200,000 |  |
Surety Bonds Outstanding | 1,000,000,000 |  | 1,000,000,000 |  |
Number of self-insurance claims managed at any one time | 1,000 |  |  |  |
Self-insurance liabilities | 717,024,000 |  | 721,284,000 | 736,130,000 | 739,029,000
Incurred but not reported percentage of liability reserves | 74.00% |  |  |  |
Residential mortgage backed securities known [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Residential mortgage-backed securities principal sold in previous period | 162,000,000 |  |  |  |
Residential mortgage backed securities other [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Residential mortgage-backed securities principal sold in previous period | $ 116,000,000 |  |  |  |

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