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Income Taxes (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
Operating Loss Carryforwards [Line Items]    
Net tax benefit (expense) $ (32,000) $ 31,000
Federal tax net operating loss carryforwards 287,400,000  
State net operating loss carryforwards 192,200,000  
Research and development tax credit carryforwards, expiration date 2020  
Tax credit carryforwards subject to expiration 2,100,000  
Net operating loss carryforwards subject to expiration 9,200,000  
Net operating losses and tax credit carryforwards, limitations on use, ownership changes 50.00%  
Net operating losses and tax credit carryforwards, limitations on use, ownership change period (years) 3  
Valuation allowance, approximately 134,700,000  
Share-based compensation, excess tax benefits 4,900,000  
Unrecognized tax benefits 51,000,000  
Federal [Member]
    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards, expiration date 2019  
Research and development tax credit carryforwards, approximately 4,100,000  
State [Member]
    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards, expiration date 2012  
Research and development tax credit carryforwards, approximately $ 6,700,000