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Commitments and Contingencies (Details Textual) (USD $) | 1 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Dec. 31, 2010 | Sep. 30, 2012 | Jun. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Sep. 30, 2012 South Edge guarantee [Member] | Dec. 31, 2011 South Edge guarantee [Member] | Jun. 06, 2011 South Edge guarantee [Member] | Oct. 26, 2011 South Edge [Member]
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserved for litigation and asserted claims |  |  | $ 16,177,000 |  | $ 10,157,000 |  |  | $ 8,720,000 |  |  |  |  |
Joint venture ownership percentage |  |  |  |  |  |  |  | 3.53% |  |  |  |  |
Maximum pro rata exposure under the guarantee |  |  | 13,492,000 |  | 13,589,000 |  |  | 13,243,000 | [1] | 13,243,000 | [1] | 13,200,000 |
Number of co-ventures in joint venture |  |  |  |  |  |  |  |  |  |  |  |  | 4
Commitments and Contingencies (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Warranty reserve |  | 29,265,000 | 22,973,000 | 21,243,000 | 23,136,000 | 26,075,000 | 25,929,000 |  |  |  |  |  |
Number of lenders filing petition for involuntary bankruptcy |  | 3 |  |  |  |  |  |  |  |  |  |  |
Amount requested in demand for arbitration related to alleged breaches | 13,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Additional amount requested in demand for arbitration related to pro rata future infrastructure improvement costs | $ 9,800,000 |  |  |  |  |  |  |  |  |  |  |  |
[1] | As discussed in Note 13, we dispute the enforceability of this guarantee, and ultimate resolution of this matter will be addressed through litigation and/or settlements.

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 13 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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