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Employee Benefits and Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

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 Condensed Consolidated Statements of Operations:

	Three months ended
	March 31, 2018				March 31, 2017
	(In thousands)
Cost of product and service revenues	$	1,019			$	982
Research and development	1,234				897
Selling, general and administrative	4,275				3,632
Total share-based compensation expense	$	6,528			$	5,511

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

The following assumptions were used to value share options and Employee Stock Purchase Plan ("ESPP") shares granted pursuant to the Company's equity incentive plans for the three months ended March 31, 2018 and 2017:

	Three months ended
	March 31, 2018			March 31, 2017
Stock Option Plans
Expected life, years	4.79			4.67
Expected volatility, %	32.2	%		31.1	%
Risk free interest rate, %	2.57	%		1.89	%
Estimated forfeiture rate %	6.9	%		7.7	%
Dividend yield, %	—	%		—	%

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

	Three months ended
	March 31, 2018			March 31, 2017
Employee Stock Purchase Plan
Expected life, years	0.5-2.0			0.5-2.0
Expected volatility, %	27.7-33.8%			25.8-32.8%
Risk free interest rate, %	0.70-2.25%			0.52-1.31%
Dividend yield, %	—	%		—	%

Stock Option Activity under the Equity Incentive Plans

The following table summarizes the share option activity under the Company’s equity incentive plans during the three months ended March 31, 2018:

	Number of Shares			Weighted-Average Exercise Price				Weighted-Average Remaining Years		Aggregate Intrinsic Value
	(In thousands, except per share data)
Stock Options
Outstanding at December 31, 2017	3,323			$	32.72			7.6		$	53,953
Granted	482			44.38
Exercised	(87	)		22.50
Expired	(1	)		24.09
Forfeited	(43	)		37.14
Outstanding at March 31, 2018	3,674			$	34.45			7.3		$	37,607
Exercisable at March 31, 2018	1,474			$	25.36			5.3		$	26,596
Vested and expected to vest at March 31, 2018 and thereafter	3,456			$	33.94			7.2		$	36,818

Restricted Stock Units Activity under the Stock Option Activity under the Equity Incentive Plans

Summaries of restricted stock activity under the Company's 2009 Equity Incentive Plan, as amended (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 ("RSUs")
Outstanding at December 31, 2017	501			$	38.90			1.5		$	24,293
Granted	71			44.32
Vested	(50	)		33.70
Forfeited	(14	)		39.05
Outstanding and unvested at March 31, 2018	508			$	40.16			1.5		$	22,041

Restricted Stock Units Award under the Stock Option Activity under the Equity Incentive Plans

	Number of Shares			Weighted-Average Grant Date Fair Value
	(In thousands, except per share data)
Restricted Stock Awards ("RSAs")
Outstanding at December 31, 2017	23			$	41.07
Granted	—			—
Vested	—			—
Forfeited	—			—
Outstanding and unvested at March 31, 2018	23			$	41.08

Performance Shares Restricted Stock Activity under the Stock Option Activity under the Equity Incentive Plans

A summary of the performance-based restricted stock activity under the 2009 Plan during the three months ended March 31, 2018 is presented below:

	Number of Shares			Weighted-Average Grant Date Fair Value Per Unit
	(In thousands, except per share data)
Performance-based Restricted Stock Units ("PSUs")
Outstanding at December 31, 2017	225			$	31.18
Granted	110			38.03
Vested	(32	)		32.37
Forfeited	(1	)		43.20
Outstanding and unvested at March 31, 2018	302			$	33.51

Shares Reserved for Future Issuance under the Stock Option Activity under the Equity Incentive Plans

The Company had the following ordinary shares reserved for future issuance under its equity incentive plans as of March 31, 2018:

	Number of Shares
	(In thousands)
Share options outstanding	3,674
Non-vested restricted share awards	833
Shares authorized for future issuance	730
ESPP shares available for future issuance	2,077
Total shares reserved for future issuance	7,314

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