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Equity Incentive Plans and Stock-Based Compensation (Details 3) (USD $)
 3 Months Ended
Mar. 31, 2012
Y
Mar. 31, 2011
Employee Stock Purchase Plan
    
Stock-Based Compensation    
Shares available for issuance 313,964  
Share-based Compensation Arrangement by Share-based Payment Award Discount from Market Price Specific Date 15.00%  
Stock-based compensation $ 700,000 $ 400,000
Unrecognized compensation cost net of expected forfeitures 200,000  
Expected weighted-average period for recognition of compensation cost (in years) 0.1  
Stock Option Plans
    
Stock-Based Compensation    
Stock options granted (in shares) 1,937,002 1,633,701
Estimated total grant date fair value 7,500,000 17,700,000
Stock-based compensation 4,300,000 5,200,000
Unrecognized compensation cost net of expected forfeitures 38,100,000  
Expected weighted-average period for recognition of compensation cost (in years) 3.4  
Total fair value of options vested 148,800,000  
Total intrinsic value of options exercised 39,000 2,100,000
Net proceeds from employee stock option 54,000  
Valuation assumptions    
Dividend yield (as a percent) 0.00% 0.00%
Expected stock price volatility (as a percent) 60.00% 52.00%
Risk free interest rate (as a percent) 0.70% 2.80%
Expected term (in years) 5.6 6.0
Weighted-average fair value of stock options granted (in dollars per share) $ 3.88 $ 10.81
Shares including nonvested equity stock and stock units
    
Stock-Based Compensation    
Stock-based compensation 1,800,000 1,700,000
Unrecognized compensation cost net of expected forfeitures 9,500,000  
Expected weighted-average period for recognition of compensation cost (in years) 2.5  
Valuation assumptions    
General nonvested equity stock service period (in years) 4  
Nonvested equity stock unit to directors, service period (in years) 1  
Total fair value of nonvested equity stock units at grant date $ 3,100,000  
Nonvested equity stock and stock units    
Nonvested at the beginning of the period (in shares) 763,510  
Granted (in shares) 423,371  
Vested (in shares) (181,099)  
Forfeited (in shares) (2,228)  
Nonvested at the end of the period (in shares) 1,003,554  
Weighted-Average Grant-Date Fair Value    
Nonvested at the beginning of the period (in dollars per share) $ 18.02  
Granted (in dollars per share) $ 7.28  
Vested (in dollars per share) $ 18.75  
Forfeited (in dollars per share) $ 7.31  
Nonvested at the end of the period (in dollars per share) $ 13.38