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Equity Incentive Plans and Stock-Based Compensation (Details 5) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Mar. 31, 2006
Stock-Based Compensation        
Number of shares reserved under the 2006 Purchase Plan 14,900,000     8,400,000
Valuation assumptions        
Dividend yield (as a percent) 0.00% 0.00% 0.00%  
Employee Stock Purchase Plans
        
Stock-Based Compensation        
Number of Employee Stock Purchase Plans 1 1 1  
Minimum number of hours of weekly employment in order to qualify for eligibility in the plan 20 20 20  
Number of shares reserved under the 2006 Purchase Plan       1,600,000
Minimum number of months of employment in a fiscal year in order to qualify for eligibility in the plan 5 5 5  
Offering period (in months) 6 6 6  
Percentage of the price at the beginning of the offering period or price at the end of each offering period to derive purchase price 85.00% 85.00% 85.00%  
Maximum share value per employee in any calendar year 25,000 25,000 25,000  
Shares issued under employee stock purchase plans 271,804 261,088 418,215  
Weighted average price per share of shares issued (in dollars per share) 15.62 14.78 8.95  
Shares available for issuance 313,964      
Stock-based compensation 1,700,000 1,600,000 1,800,000  
Unrecognized compensation cost net of expected forfeitures 900,000      
Expected weighted-average period for recognition of compensation cost (in years) 0.33      
Valuation assumptions        
Dividend yield (as a percent) 0.00% 0.00% 0.00%  
Expected stock price volatility rate minimum (as a percent) 56.00% 50.00% 86.00%  
Expected stock price volatility rate maximum (as a percent) 78.00% 54.00% 92.00%  
Risk free interest rate (as a percent) 0.10%      
Risk free interest rate minimum (as a percent)   0.20% 0.20%  
Risk free interest rate maximum (as a percent)   0.30% 0.30%  
Expected term (in years) 0.5 0.5 0.5  
Weighted-average fair value of purchase rights granted under the purchase plan (in dollars per share) 6.16 6.45 5.52  
Weighted-Average Grant-Date Fair Value        
Granted (in dollars per share) 6.16 6.45 5.52  
Stock Option Plans
        
Stock-Based Compensation        
Options granted (in shares) 2,357,001 1,921,743 1,487,905  
Estimated total grant date fair value 24,200,000 24,900,000 10,200,000  
Stock-based compensation 19,600,000 22,600,000 24,400,000  
Unrecognized compensation cost net of expected forfeitures 35,800,000      
Expected weighted-average period for recognition of compensation cost (in years) 3.3      
Total fair value of options vested 144,800,000 137,900,000 195,200,000  
Total intrinsic value of options exercised 6,200,000 9,100,000 8,300,000  
Total proceeds received and receivable from employee stock option exercises 7,400,000 12,900,000 16,700,000  
Proceeds receivable from employee stock option exercises included in prepaid and other assets   600,000 300,000  
Valuation assumptions        
Dividend yield (as a percent) 0.00% 0.00% 0.00%  
Expected stock price volatility rate minimum (as a percent) 50.00% 49.00% 89.00%  
Expected stock price volatility rate maximum (as a percent) 75.00% 69.00% 96.00%  
Risk free interest rate minimum (as a percent) 1.40% 2.00% 1.80%  
Risk free interest rate maximum (as a percent) 2.80% 3.20% 2.80%  
Expected term, minimum (in years) 6.0 5.9 5.3  
Expected term, maximum (in years) 6.1 6.2 6.1  
Weighted average grant date fair value (in dollars per share) 10.27 12.98 6.85  
Shares including nonvested equity stock and stock units
        
Stock-Based Compensation        
Stock-based compensation 6,700,000 6,300,000 5,400,000  
Unrecognized compensation cost net of expected forfeitures 8,400,000      
Expected weighted-average period for recognition of compensation cost (in years) 1.8      
Valuation assumptions        
Weighted-average fair value of purchase rights granted under the purchase plan (in dollars per share) 17.86 21.87 11.12  
Nonvested equity stock unit to employees and officers, 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 6,700,000      
Nonvested equity stock and stock units        
Nonvested at the beginning of the period (in shares) 718,007 783,976 821,064  
Granted (in shares) 374,838 302,312 279,476  
Vested (in shares) (314,401) (314,045) (290,564)  
Forfeited (in shares) (14,934) (54,236) (26,000)  
Nonvested at the end of the period (in shares) 763,510 718,007 783,976  
Weighted-Average Grant-Date Fair Value        
Nonvested at the beginning of the period (in dollars per share) 18.23 16.24 18.46  
Granted (in dollars per share) 17.86 21.87 11.12  
Vested (in dollars per share) 18.15 17.18 17.43  
Forfeited (in dollars per share) 21.76 15.76 18.05  
Nonvested at the end of the period (in dollars per share) 18.02 18.23 16.24