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Organization and Basis of Presentation (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011 | Jun. 06, 2011
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Repayment and completion guarantees |  |  |
Maximum pro rata exposure under the guarantee | $ 13,581 | $ 13,589 |
Repayment guarantees [Member] |  |  |
Repayment and completion guarantees |  |  |
Maximum pro rata exposure under the guarantee | 338 | 346 |
Completion guarantees [Member] |  |  |
Repayment and completion guarantees |  |  |
Maximum pro rata exposure under the guarantee | 0 | 0 |
South Edge guarantee [Member] |  |  |
Repayment and completion guarantees |  |  |
Maximum pro rata exposure under the guarantee | $ 13,243 | $ 13,243 | $ 13,200

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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-Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 13 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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