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Income Taxes (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Income Tax Contingency [Line Items]          
Income tax expense (benefit) $ (2,510,000) $ 2,052,000 $ (4,335,000) $ (3,814,000)  
Income taxes receivable 28,897,000   28,897,000   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 federal NOL carryforward 175,700,000   175,700,000    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 38,100,000   38,100,000    
Possible decrease in unrecognized tax benefits $ 24,600,000   $ 24,600,000    
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