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Employee Benefits and Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation Expense Recognized in Consolidate Statements of Income

The following table sets forth the total share-based compensation expense recognized in the Company's Consolidated Statements of Operations:

	Year Ended December 31,
	2017				2016				2015
	(In thousands)
Cost of product and service revenues	$	3,478			$	2,596			$	2,111
Research and development	3,590				3,128				2,060
Selling, general and administrative	14,789				13,776				10,750
Total share-based compensation expense	$	21,857			$	19,500			$	14,921

Estimate of Fair Value of Share-Based Awards, Stock Options

The following assumptions were used to value share options and ESPP shares granted pursuant to our equity incentive

plans:

	Year Ended December 31,
	2017			2016			2015
Stock Option Plans
Risk-free interest rate	1.9	%		1.5	%		1.7	%
Dividend yield	—	%		—	%		—	%
Expected volatility	29.6	%		30.6	%		32.0	%
Expected life (in years)	4.7 years			4.9 years			5.0 years

Estimate of Fair Value of Share-Based Awards, Employee Stock Purchase Plan

	Year Ended December 31,
	2017			2016			2015
Employee Stock Purchase Plan
Risk-free interest rate	0.52% - 1.39%			0.34% - 0.79%			0.03% - 0.79%
Dividend yield	—	%		—	%		—	%
Expected volatility	25.8% - 32.8%			25.8% - 34.8%			25.7% - 37.5%
Expected life (in years)	0.5 - 2.0			0.5 - 2.0			0.5 - 2.0

Stock Option Activity under the 2009 Plan

A summary of the stock option activity under the 2009 Plan is presented below:

	Number of Shares			Weighted-Average Exercise Price				Weighted-Average Remaining Years		Aggregate Intrinsic Value
	(In thousands, except per share data)
Outstanding at December 31, 2016	3,214			$	26.06			7.3		$	26,331
Granted (Awarded)	1,045			$	45.13
Exercised (Released)	(813	)		$	22.28
Expired	(6	)		$	27.54
Forfeited	(117	)		$	33.39
Outstanding at December 31, 2017	3,323			32.72				7.6		$	53,953
Exercisable at December 31, 2017	1,350			23.87				5.8		33,293
Vested and expected to vest at December 31, 2017 and thereafter	3,323			32.72				7.6		$	53,953

Restricted Stock Units Activity under the 2009 Plan

Summaries of the restricted stock activity under the 2009 Plan are presented below:

	Number of Shares			Weighted-Average Grant Date Fair Value				Weighted-Average Remaining Years		Aggregate Intrinsic Value
	(In thousands, except per share data)
Restricted Stock Units
Non-vested at December 31, 2016	505			$	31.42			1.6		$	17,135
Granted (Awarded)	245			45.97
Vested (Released)	(215	)		30.41
Forfeited	(34	)		32.39
Non-vested at December 31, 2017	501			38.90				1.5		$	24,293

Restricted Stock Awards under the 2009 Plan

	Number of Shares			Weighted-Average Grant Date Fair Value
	(In thousands, except per share data)
Restricted Stock Awards
Non-vested at December 31, 2016	30			$	31.57
Granted (Awarded)	23			41.10
Vested (Released)	(30	)		31.58
Non-vested at December 31, 2017	23			$	41.07

Performance Shares Restricted Stock Activity under the 2009 Plan

A summary of the performance-based restricted stock activity under the 2009 Plan is presented below:

	Number of Shares			Weighted-Average Grant Date Fair Value Per Unit
	(In thousands, except per share data)
Non-vested at December 31, 2016	184			$	24.89
Granted (Awarded)	148			34.05
Vested (Released)	(107	)		24.36
Non-vested at December 31, 2017	225			$	31.18

Schedule of Share-based Compensation, Future Issuance of Shares

The Company had the following ordinary shares reserved for future issuance under its equity incentive plans as of December 31, 2017:

		Number of Shares
		(In thousands)
Share options outstanding		3,323
Non-vested restricted stock awards		749
Shares authorized for future issuance		1,398
ESPP shares available for future issuance		2,365
Total shares reserved for future issuance		7,835

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