Net Income Per Share Available to Common Stock (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Net Income Per Share Available to Common Stock

The following table sets forth the computation of our basic and diluted net income per share available to common stock (in thousands, except per share amounts):

	Year Ended December 31,
	2018			2017			2016
Numerator:
Basic:
Net income	$	328,115		$	423,201		$	184,189
Less: undistributed earnings allocated to participating securities	(189		)	(801		)	(1,224		)
Net income available to common stockholders, basic	$	327,926		$	422,400		$	182,965
Diluted:
Net income attributable to common stockholders, basic	$	327,926		$	422,400		$	182,965
Add: undistributed earnings allocated to participating securities	15			68			74
Net income attributable to common stockholders, diluted	$	327,941		$	422,468		$	183,039
Denominator:
Basic:
Weighted-average shares used in computing net income per share available to common stockholders, basic	74,750			72,258			68,771
Diluted:
Weighted-average shares used in computing net income per share available to common stockholders, basic	74,750			72,258			68,771
Add weighted-average effect of dilutive securities:
Stock options, RSUs and RSAs	6,083			6,599			4,408
Employee stock purchase plan	11			120			43
Weighted-average shares used in computing net income per share available to common stockholders, diluted	80,844			78,977			73,222
Net income per share attributable to common stockholders:
Basic	$	4.39		$	5.85		$	2.66
Diluted	$	4.06		$	5.35		$	2.50

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net income per share available to common stockholders for the periods presented because including them would have been anti-dilutive (in thousands):

	Year Ended December 31,
	2018	2017	2016
Stock options and RSUs to purchase common stock	140	58	2,594
Employee stock purchase plan	71	—	—
Total	211	58	2,594