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Equity Incentive Plans and Stock-Based Compensation (Details 3) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2012
Options        
Number of Shares        
Outstanding, at the beginning of the period (in shares) 8,995,017 11,441,646 11,377,146  
Options granted (in shares) 500,000 362,335 2,370,313  
Options exercised (in shares) (1,405,077) (1,184,141) (905,464)  
Stock options forfeited (in shares) (1,081,107) (1,624,823) (1,400,349)  
Outstanding, at the end of the period (in shares) 7,008,833 8,995,017 11,441,646  
Vested or expected to vest at the end of the period (in shares) 6,880,321      
Options exercisable at the end of the period (in shares) 4,752,346      
Weighted Average Exercise Price        
Outstanding at the beginning of the year (in dollars per shares) $ 10.01 $ 10.73 $ 11.32  
Options granted (in dollars per share) 12.29 11.27 9.63  
Options exercised (in dollars per share) 7.27 7.42 6.93  
Options forfeited (in dollars per share) 18.98 17.22 16.13  
Outstanding at the end of the period (in dollars per shares) 9.34 $ 10.01 $ 10.73  
Vested or expected to vest at the end of the period (in dollars per share) 9.34      
Options exercisable at the end of the period (in dollars per share) $ 10.05      
Weighted Average Remaining Contractual Term (in years)        
Outstanding (in years) 4 years 11 months 23 days      
Vested or expected to vest (in years) 4 years 11 months 9 days      
Options exercisable (in years) 4 years 3 months 7 days      
Aggregate Intrinsic Value        
Outstanding $ 37,202      
Vested or expected to vest 36,603      
Options exercisable $ 23,812      
Closing stock price (in dollars per share) $ 13.77      
Total number of in-the-money outstanding (in shares) 5,849,154      
Total number of in-the-money exercisable (in shares) 3,617,874      
Stock Options with Market Condition        
Number of Shares        
Outstanding, at the beginning of the period (in shares) 1,315,000      
Options granted (in shares)       1,795,000
Outstanding, at the end of the period (in shares) 1,135,000 1,315,000