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Investment in Unconsolidated Joint Ventures (Temco Associates, LLC) (Details) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Temco Associates
Dec. 31, 2012
Temco Associates
Venture
Dec. 31, 2012
Forestar [Member]
Temco Associates
Dec. 31, 2012
Residential Real Estate [Member]
Temco Associates
Venture
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage of partner joint venture (percent)           50.00%  
Number of joint ventures (ventures)         2   1
Share of impairment charges       $ 14,600,000      
Impairment losses 488,000 100,131,000 2,554,000 608,000      
Cash balance of joint venture         $ 91,000