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Stock Plans - RSAs, RSUs, PSAs and PSUs (Details) - RSAs, RSUs, PSAs and PSUs - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Shares      
Outstanding at the beginning of the period (in shares) 1,398 1,237 1,158
Granted (in shares) 1,166 672 395
Released (in shares) (349) (389) (183)
Forfeited (in shares) (266) (122) (133)
Outstanding at the end of the period (in shares) 1,949 1,398 1,237
Weighted Average Grant Date Fair Value      
Outstanding at the beginning of the period (in dollars per share) $ 31.97 $ 34.27 $ 34.93
Granted (in dollars per share) 17.59 30.33 34.18
Released (in dollars per share) 32.73 35.65 38.65
Forfeited (in dollars per share) 27.31 34.46 33.66
Outstanding at the end of the period (in dollars per share) $ 23.85 $ 31.97 $ 34.27
Total fair value of shares vested $ 7.5 $ 9.6 $ 6.2
Minimum      
Weighted Average Grant Date Fair Value      
Vesting period 1 year    
Maximum      
Weighted Average Grant Date Fair Value      
Vesting period 5 years