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Income Taxes (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Tax Contingency [Line Items]        
Income Taxes Receivable $ 31,924,000 $ 27,154,000    
Net deferred tax assets 2,469,271,000 2,517,589,000    
Valuation allowance (2,469,271,000) (2,517,589,000)    
Section 382 limitation amount per year 67,400,000      
Section 382 limitation period 60 months      
Gross federal NOL carryforward 2,200,000,000      
Gross unrecognized tax benefits 170,425,000 171,863,000 258,016,000 326,088,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 166,300,000 170,600,000    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 31,500,000 36,900,000    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 5,400,000 11,400,000    
Possible decrease in unrecognized tax benefits $ 24,900,000      
Minimum [Member]
        
Income Tax Contingency [Line Items]        
Operating Loss Carryforwards, Expiration Dates 2013      
Income Tax Examination, Year(s) under Examination 2003      
Maximum [Member]
        
Income Tax Contingency [Line Items]        
Operating Loss Carryforwards, Expiration Dates 2032      
Income Tax Examination, Year(s) under Examination 2012