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Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2015

Employee Benefits and Share-based Compensation [Abstract]

Option Activity

Stock option activity during the year ended December 31, 2015 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 at December 31, 2014	3,939		$	30.58
Granted	296		31.34
Exercised	(1,353	)	30.55
Cancelled	(163	)	33.09
Expired	(258	)	34.78
Outstanding at December 31, 2015	2,461		$	30.08	5.7	$	29,109

As of December 31, 2015:
Vested and expected to vest	2,386		$	30.02	5.6	$	28,358
Exercisable Options	1,784		$	29.26	4.7	$	22,562

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, 2015:



	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 - $28.79	591	3.01	$	20.84	585	$	20.77
$29.23 - $31.31	573	6.65	30.86		274	30.39
$31.45 - $32.54	557	7.53	32.49		291	32.48
$32.55 - $35.32	583	5.70	34.24		504	34.32
$36.80 - $40.01	157	5.25	38.13		130	38.36
$10.69 - $40.01	2,461	5.66	$	30.08	1,784	$	29.26

Schedule Of RSU Activity

RSU Activity

RSU activity during the year ended December 31, 2015 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 at December 31, 2014	858		$	30.68
RSUs granted	525		32.16
RSUs vested	(285	)	31.06
RSUs cancelled	(134	)	31.52
Outstanding at December 31, 2015	964		$	31.63	1.46	$	40,399

Schedule Of Valuation And Expense Information

The following table sets forth the weighted-average assumptions used to estimate the fair value stock option grants during the years ended December 31, 2015, 2014 and 2013:



	Year Ended December 31,
	2015		2014		2013
Expected life (in years)	4.5		4.5		4.4
Risk-free interest rate	1.44	%	1.43	%	0.72	%
Expected volatility	39.3	%	42.6	%	48.05	%
Dividend yield	—		—		—

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 (in thousands):



	Year Ended December 31,
	2015		2014		2013
Cost of revenue	$	1,566	$	2,037	$	1,577
Research and development	3,451		4,916		3,943
Sales and marketing	5,022		6,168		5,379
General and administrative	6,786		6,893		6,563
Total	$	16,825	$	20,014	$	17,462