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Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

Employee Benefits and Share-based Compensation, Noncash [Abstract]

Option Activity

Stock option activity during the year ended December 31, 2017 was as follows:



	Number of Shares		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
	(In thousands)		(In dollars)		(In years)	(In thousands)
Outstanding as of December 31, 2016	1,884		$	31.14
Granted	348		43.07
Exercised	(352	)	27.23
Expired	(1	)	31.70
Outstanding as of December 31, 2017	1,879		$	34.08	6.13	$	46,346

As of December 31, 2017
Vested and expected to vest	1,879		$	34.08	6.13	$	46,346
Exercisable Options	1,205		$	30.94	4.72	$	33,512

Schedule of Ranges of Outstanding And Exercisable Stock Options

The following table summarizes significant ranges of outstanding and exercisable stock options as of December 31, 2017:



	Options Outstanding				Options Exercisable
Range of Exercise Prices	Shares Outstanding	Weighted- Average Remaining Contractual Life	Weighted- Average Exercise Price Per Share		Shares Exercisable	Weighted- Average Exercise Price Per Share
	(In thousands)	(In years)	(In dollars)		(In thousands)	(In dollars)
$10.69 - $31.28	435	4.55	$	24.55	334	$	22.50
$31.31 - $32.54	443	5.50	32.19		410	32.16
$32.55 - $39.53	651	5.84	36.93		459	35.93
$40.01 - $42.70	330	9.39	42.68		2	40.01
$49.20 - $49.20	20	9.80	49.20		—	—
$10.69 - $49.20	1,879	6.13	$	34.08	1,205	$	30.94

Schedule Of RSU Activity

RSU Activity

RSU activity during the year ended December 31, 2017 was as follows:



	Number of Shares		Weighted Average Grant Date Fair Value Per Share		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
	(In thousands)		(In dollars)		(In years)	(In thousands)
Outstanding as of December 31, 2016	996		$	36.22
Granted	618		49.45
Vested	(412	)	35.46
Cancelled	(72	)	44.16
Outstanding as of December 31, 2017	1,130		$	43.22	1.43	$	66,390

Schedule Of Valuation And Expense Information

The following table sets forth the weighted-average assumptions used to estimate the fair value option grants during the years ended December 31, 2017, 2016 and 2015 and purchase rights granted under the ESPP commencing February 16, 2016 during the years ended December 31, 2017 and 2016:



	Year Ended December 31,
	2017		2016		2015		2017		2016		2015
	Stock Options						ESPP
Expected life (in years)	4.4		4.4		4.5		0.5		0.5		N/A
Risk-free interest rate	1.66	%	1.28	%	1.44	%	0.93	%	0.43	%	N/A
Expected volatility	31.6	%	35.4	%	39.3	%	29.7	%	38.3	%	N/A
Dividend yield	—		—		—		—		—		N/A

Schedule Of Total Stock-Based Compensation Expense Resulting From Stock Options, Restricted Stock Awards, And The Employee Stock Purchase Plan

The following table sets forth stock-based compensation expense resulting from stock options, restricted stock awards, and the Employee Stock Purchase Plan included in the Company’s consolidated statements of operations:



	Year Ended December 31,
	2017		2016		2015
	(In thousands)
Cost of revenue	$	2,005	$	1,740	$	1,566
Research and development	4,927		4,075		3,451
Sales and marketing	5,959		5,065		5,022
General and administrative	9,256		8,069		6,786
Total	$	22,147	$	18,949	$	16,825