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Equity Incentive Plans and Stock-Based Compensation (Details 5)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 23, 2015
shares
Apr. 24, 2014
shares
Sep. 27, 2013
shares
Apr. 30, 2012
shares
Apr. 30, 2009
shares
Jun. 30, 2012
shares
Dec. 31, 2015
USD ($)
plan
$ / shares
shares
Dec. 31, 2014
USD ($)
plan
$ / shares
shares
Dec. 31, 2013
USD ($)
plan
$ / shares
shares
Dec. 31, 2012
$ / shares
shares
Mar. 31, 2006
shares
Stock-Based Compensation                      
Number of shares reserved under the purchase plan             35,400,000       8,400,000
Increase in shares approved for issuance         6,500,000 6,500,000          
Employee Stock [Member]                      
Stock-Based Compensation                      
Number of employee stock purchase plans | plan             2 1 1    
Minimum number of hours of weekly employment in order to qualify for eligibility in the plan             20 hours 20 hours 20 hours    
Number of shares reserved under the purchase plan                     1,600,000
Employee Stock Purchase Plan, Number Of Additional SharesToBe Authorized     1,500,000                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 2,000,000 1,500,000   1,500,000              
Minimum number of months of employment in a fiscal year in order to qualify for eligibility in the plan             5 months 5 months 5 months    
Offering period (in months)             6 months 6 months 6 months    
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             544,391 596,188 1,063,283    
Weighted average price per share of shares issued (in dollars per share) | $ / shares             $ 9.36 $ 8.25 $ 4.87    
Shares available for issuance             2,000,000        
Stock-based compensation | $             $ 1,600,000 $ 2,600,000 $ 1,500,000    
Unrecognized compensation cost net of expected forfeitures | $             $ 700,000        
Expected weighted-average period for recognition of compensation cost (in years)             4 months        
Valuation assumptions                      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                 0.10%    
Expected stock price volatility rate minimum (as a percent)             34.00% 39.00% 44.00%    
Expected stock price volatility rate maximum (as a percent)             42.00% 44.00% 48.00%    
Risk free interest rate minimum (as a percent)             0.10% 0.00%      
Risk free interest rate maximum (as a percent)             0.30% 0.10%      
Expected term (in years)             6 months   6 months    
Weighted-average fair value of purchase rights granted under the purchase plan (in dollars per share) | $ / shares             $ 3.06 $ 3.57 $ 1.96    
Weighted-Average Grant-Date Fair Value                      
Granted (in dollars per share) | $ / shares             $ 3.06 $ 3.57 $ 1.96    
Stock Compensation Plan [Member]                      
Stock-Based Compensation                      
Number of shares reserved under the purchase plan 4,000,000                    
Increase in shares approved for issuance   10,000,000                  
Shares available for issuance             11,173,545.000        
Valuation assumptions                      
Dividend yield (as a percent)             0.00% 0.00% 0.00%    
Options                      
Stock-Based Compensation                      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate             41.00%        
Options granted (in shares)             362,335 2,370,313 2,084,276    
Estimated total grant date fair value | $             $ 1,700,000 $ 10,100,000 $ 5,400,000    
Stock-based compensation | $             7,200,000 9,300,000 10,400,000    
Unrecognized compensation cost net of expected forfeitures | $             $ 6,300,000        
Expected weighted-average period for recognition of compensation cost (in years)             1 year 9 months        
Total fair value of options vested | $             $ 41,400,000 55,300,000 64,300,000    
Total intrinsic value of options exercised | $             6,800,000 4,400,000 1,300,000    
Proceeds from Stock Options Exercised | $             $ 8,800,000 $ 6,300,000 $ 3,300,000    
Valuation assumptions                      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate             1.20%        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number             8,995,017 11,441,646 11,377,146 13,094,815  
Expected stock price volatility rate minimum (as a percent)               40.00% 45.00%    
Expected stock price volatility rate maximum (as a percent)               44.00% 47.00%    
Risk free interest rate minimum (as a percent)               2.10% 0.80%    
Risk free interest rate maximum (as a percent)               2.20% 1.50%    
Expected term (in years)             6 years        
Weighted average grant date fair value (in dollars per share) | $ / shares             $ 4.59 $ 4.26 $ 2.60    
Restricted Stock and Stock Units [Member]                      
Stock-Based Compensation                      
Stock-based compensation | $             $ 6,300,000 $ 2,800,000 $ 3,100,000    
Unrecognized compensation cost net of expected forfeitures | $             $ 23,700,000        
Expected weighted-average period for recognition of compensation cost (in years)             3 years 1 month 6 days        
Total fair value of nonvested equity stock units at grant date | $             $ 33,300,000 $ 4,100,000 $ 3,300,000    
Valuation assumptions                      
Weighted-average fair value of purchase rights granted under the purchase plan (in dollars per share) | $ / shares             $ 11.62 $ 10.40 $ 6.92    
Nonvested equity stock and stock units                      
Nonvested at the beginning of the period (in shares)             673,864 629,649 922,491    
Granted (in shares)             2,865,878 390,502 473,074    
Vested (in shares)             (276,622) (262,580) (478,214)    
Forfeited (in shares)             (255,002) (83,707) (287,702)    
Nonvested at the end of the period (in shares)             3,008,118 673,864 629,649 922,491  
Weighted-Average Grant-Date Fair Value                      
Nonvested at the beginning of the period (in dollars per share) | $ / shares             $ 9.23 $ 8.56 $ 10.24    
Granted (in dollars per share) | $ / shares             11.62 10.40 6.92    
Vested (in dollars per share) | $ / shares             9.94 9.85 9.81    
Forfeited (in dollars per share) | $ / shares             10.64 7.69 9.18    
Nonvested at the end of the period (in dollars per share) | $ / shares             $ 11.32 $ 9.23 $ 8.56 $ 10.24  
Performance Stock Units [Member]                      
Stock-Based Compensation                      
Stock-based compensation | $             $ 1,100,000        
Minimum                      
Stock-Based Compensation                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage             0.00%        
Minimum | Employee Stock [Member]                      
Valuation assumptions                      
Expected term (in years)               7 days      
Minimum | Options                      
Valuation assumptions                      
Expected term (in years)               6 years 5 years 4 months 24 days    
Maximum                      
Stock-Based Compensation                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage             150.00%        
Maximum | Employee Stock [Member]                      
Valuation assumptions                      
Expected term (in years)               6 months      
Maximum | Options                      
Valuation assumptions                      
Expected term (in years)               6 years 1 month 6 days 5 years 6 months    
Option One                      
Stock-Based Compensation                      
Required service period             60 months        
Option Two                      
Stock-Based Compensation                      
Required service period             48 months        
Stock Options with Market Condition [Member]                      
Stock-Based Compensation                      
Options granted (in shares)                   1,795,000  
Valuation assumptions                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number             1,315,000 1,315,000