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Income Taxes (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Income Tax Contingency [Line Items]                        
Income tax expense (benefit) $ (22,896,000) $ (73,202,000) $ 2,052,000 $ (5,866,000) $ (25,047,000) $ (28,721,000) $ (82,029,000) $ (2,020,000) $ (99,912,000) $ (137,817,000) $ (792,552,000)  
Effective Income Tax Rate                 32.20% 11.20% 40.10%  
Income taxes receivable 27,154,000       81,307,000       27,154,000 81,307,000    
Net deferred tax assets 2,517,589,000       2,571,687,000       2,517,589,000 2,571,687,000    
Valuation allowance (2,517,589,000)       (2,571,687,000)       (2,517,589,000) (2,571,687,000)    
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 federal NOL carryforward 1,900,000,000               1,900,000,000      
Gross unrecognized tax benefits 171,863,000       258,016,000       171,863,000 258,016,000 326,088,000 126,299,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 170,600,000       250,700,000       170,600,000 250,700,000    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 36,900,000       48,400,000       36,900,000 48,400,000    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense                 11,400,000 27,300,000    
Possible decrease in unrecognized tax benefits $ 26,500,000               $ 26,500,000      
Minimum [Member]
                        
Income Tax Contingency [Line Items]                        
Net operating loss carryforward number of years until expiration                 5      
Operating Loss Carryforwards, Expiration Dates                 2012      
Income Tax Examination, Year(s) under Examination                 1998      
Maximum [Member]
                        
Income Tax Contingency [Line Items]                        
Net operating loss carryforward number of years until expiration                 20      
Operating Loss Carryforwards, Expiration Dates                 2031      
Income Tax Examination, Year(s) under Examination                 2011