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Income Taxes (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Income Taxes          
Income tax (benefit) expense $ 2,052,000 $ (82,029,000) $ (3,814,000) $ (84,049,000)  
Income taxes receivable 78,864,000   78,864,000   81,307,000
Deferred tax assets, gross 2,600,000,000   2,600,000,000   2,600,000,000
Deferred tax assets, valuation allowance 2,600,000,000   2,600,000,000   2,600,000,000
Section 382 limitations on use of pre-ownership Centex losses     67,400,000    
Period in which to recognize Section 382 limitations on use of pre-ownership Centex losses, months     60    
Gross unrecognized tax benefits 248,500,000   248,500,000    
Accrued interest and penalties 50,400,000   50,400,000    
Possible decrease in unrecognized tax benefits $ 106,900,000   $ 106,900,000