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Net Income Per Share Available to Common Stock - Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator:        
Net income $ 133,722 $ 51,257 $ 319,368 $ 125,406
Less: undistributed earnings allocated to participating securities (182) (295) (725) (931)
Net income attributable to common stockholders, basic 133,540 50,962 318,643 124,475
Add: undistributed earnings allocated to participating securities 15 18 61 56
Net income attributable to common stockholders, diluted $ 133,555 $ 50,980 $ 318,704 $ 124,531
Denominator:        
Weighted-average shares used in computing net income per share available to common stockholders, basic (in shares) 72,588 69,076 71,903 68,365
Add weighted-average effect of dilutive securities:        
Stock options and RSUs (in shares) 6,636 4,357 6,528 4,429
Employee stock purchase plan (in shares) 98 20 97 17
Weighted-average shares used in computing net income per share available to common stockholders, diluted (in shares) 79,322 73,453 78,528 72,811
Net income per share attributable to common stockholders:        
Basic (in dollars per share) $ 1.84 $ 0.74 $ 4.43 $ 1.82
Diluted (in dollars per share) $ 1.68 $ 0.69 $ 4.06 $ 1.71