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Equity Incentive Plans and Stock-Based Compensation (Details 3) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Valuation assumptions    
Dividend yield (as a percent) 0.00%  
Employee Stock Purchase Plan
    
Stock-Based Compensation    
Shares available for issuance 1,082,515  
Shares issued at discount from the fair market value (as a percent) 15.00%  
Stock-based compensation $ 500,000 $ 700,000
Unrecognized compensation cost net of expected forfeitures 200,000  
Expected weighted-average period for recognition of compensation cost 1 month  
Stock Option Plans
    
Stock-Based Compensation    
Stock options granted (in shares) 1,619,437 1,937,002
Estimated total grant date fair value 3,800,000 7,500,000
Stock-based compensation 3,100,000 4,300,000
Unrecognized compensation cost net of expected forfeitures 26,600,000  
Expected weighted-average period for recognition of compensation cost 2 years 9 months 22 days  
Total fair value of options vested 76,300,000  
Total intrinsic value of options exercised   39,000
Valuation assumptions    
Expected stock price volatility (as a percent) 47.00% 60.00%
Risk free interest rate (as a percent) 0.90% 0.70%
Expected term 5 years 4 months 29 days 5 years 7 months 6 days
Weighted-average fair value of stock options granted (in dollars per share) $ 2.33 $ 3.88
Shares including nonvested equity stock and stock units
    
Stock-Based Compensation    
Stock-based compensation 1,300,000 1,800,000
Unrecognized compensation cost net of expected forfeitures 5,100,000  
Expected weighted-average period for recognition of compensation cost 2 years 2 months 24 days  
Valuation assumptions    
General nonvested equity stock service period (in years) 4 years  
Nonvested equity stock unit to directors, service period 1 year  
Total fair value of nonvested equity stock units at grant date $ 1,500,000 $ 3,100,000
Nonvested equity stock and stock units    
Nonvested at the beginning of the period (in shares) 922,491  
Granted (in shares) 276,496 423,371
Vested (in shares) (178,666)  
Forfeited (in shares) (58,911)  
Nonvested at the end of the period (in shares) 961,410  
Weighted-Average Grant-Date Fair Value    
Nonvested at the beginning of the period (in dollars per share) $ 10.24  
Granted (in dollars per share) $ 5.46  
Vested (in dollars per share) $ 14.02  
Forfeited (in dollars per share) $ 13.97  
Nonvested at the end of the period (in dollars per share) $ 7.93