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Income Taxes (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Income Tax Contingency [Line Items]          
Income tax expense (benefit) $ (10,727,000) $ (73,202,000) $ (15,062,000) $ (77,016,000)  
Income taxes receivable 28,282,000   28,282,000   27,154,000
Net deferred tax assets 2,500,000,000   2,500,000,000   2,500,000,000
Valuation allowance 2,500,000,000   2,500,000,000   2,500,000,000
Section 382 limitations on use of pre-ownership Centex losses per year     67,400,000    
Period in which to recognize Section 382 limitations on use of pre-ownership Centex losses, months     60    
Gross unrecognized tax benefits 168,100,000   168,100,000    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 33,600,000   33,600,000    
Possible decrease in unrecognized tax benefits $ 27,800,000   $ 27,800,000    
Minimum [Member]
          
Income Tax Contingency [Line Items]          
Income Tax Examination, Year under Examination 2003        
Maximum [Member]
          
Income Tax Contingency [Line Items]          
Income Tax Examination, Year under Examination 2012