Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details Textual)

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Commitments and Contingencies (Details Textual) (USD $)
1 Months Ended 6 Months Ended
Mar. 31, 2012
Dec. 31, 2010
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Jun. 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]                    
Joint venture ownership percentage             3.53%      
Maximum pro rata exposure under the guarantee     $ 13,581,000 $ 13,589,000     $ 13,243,000 $ 13,243,000 $ 13,200,000  
Number of co-ventures in joint venture                   4
Commitments and Contingencies (Textual) [Abstract]                    
Reserved for Litigation and Asserted Claims     8,991,000 10,157,000            
Warranty Reserve 21,705,000 29,265,000 21,243,000 23,136,000 25,929,000 27,210,000        
Number of lenders filing petition for involuntary bankruptcy   3                
Amount requested in demand for arbitration related to alleged breaches 13,500,000   13,500,000              
Additional amount requested in demand for arbitration related to pro rata future infrastructure improvement costs $ 9,800,000