Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details Textual)

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Commitments and Contingencies (Details Textual) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended
Dec. 09, 2010
lender
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
South Edge guarantee [Member]
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]
JointVenture
Loss Contingencies [Line Items]                    
Reserved for litigation and asserted claims     $ 16,067,000 $ 10,157,000     $ 8,700,000      
Joint venture ownership percentage           3.53%        
Maximum pro rata exposure under the guarantee     13,462,000 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     22,064,000 23,136,000 29,265,000          
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                
Operating Leases, Rent Expense, Net [Abstract]                    
Rent expense     5,500,000 6,100,000 7,500,000          
Sublease income     $ 2,000,000 $ 2,300,000 $ 2,700,000          
[1] As discussed in Note 13, although we have a reserve for the amounts we believe are appropriate, we dispute the enforceability of this guarantee, and ultimate resolution of this matter will be addressed through litigation and/or arbitration.