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Income Taxes (Narrative) (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Income Tax Contingency [Line Items]      
Income tax expense (benefit) $ (1,825,000) $ (5,866,000)  
Income taxes receivable 29,673,000   27,154,000
Net deferred tax assets 2,500,000,000   2,500,000,000
Valuation allowance 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 federal NOL carryforward 179,300,000    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 39,200,000    
Possible decrease in unrecognized tax benefits $ 19,100,000    
Minimum [Member]
      
Income Tax Contingency [Line Items]      
Income Tax Examination, Year(s) under Examination 1998    
Maximum [Member]
      
Income Tax Contingency [Line Items]      
Income Tax Examination, Year(s) under Examination 2012