Employee Benefits and Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

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

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

	Year Ended
	December 31, 2015		December 31, 2014		December 31, 2013
Stock Option Plans
Risk-free interest rate	1.7	%	1.6	%	1.2	%
Dividend yield	—	%	—	%	—	%
Expected volatility	32.0	%	34.9	%	43.1	%
Expected life (in years)	5.04		4.8		5.3

	Year Ended
	December 31, 2015		December 31, 2014		December 31, 2013
Employee Stock Purchase Plan
Risk-free interest rate	0.03% - 0.79%		0.03% - 0.53%		0.03% - 0.85%
Dividend yield	—	%	—	%	—	%
Expected volatility	25.7% - 37.5%		29.5% - 42.1%		29.5% - 44.8%
Expected life (in years)	0.5 - 2.0		0.5 - 2.0		0.5 - 2.0

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

	Year Ended
	December 31, 2015		December 31, 2014		December 31, 2013
Stock Option Plans
Risk-free interest rate	1.7	%	1.6	%	1.2	%
Dividend yield	—	%	—	%	—	%
Expected volatility	32.0	%	34.9	%	43.1	%
Expected life (in years)	5.04		4.8		5.3

	Year Ended
	December 31, 2015		December 31, 2014		December 31, 2013
Employee Stock Purchase Plan
Risk-free interest rate	0.03% - 0.79%		0.03% - 0.53%		0.03% - 0.85%
Dividend yield	—	%	—	%	—	%
Expected volatility	25.7% - 37.5%		29.5% - 42.1%		29.5% - 44.8%
Expected life (in years)	0.5 - 2.0		0.5 - 2.0		0.5 - 2.0

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 Income:

	Year Ended
	December 31, 2015		December 31, 2014		December 31, 2013
	(In thousands)
Cost of product and service revenues	$	2,111	$	1,456	$	1,241
Research and development	2,060		1,655		1,359
Selling, general and administrative	10,750		9,674		8,551
Total share-based compensation expense	$	14,921	$	12,785	$	11,151

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, 2014	2,672		$	19.02	6.5
Granted (Awarded)	728		31.21
Exercised (Released)	(598	)	15.51
Expired	(5	)	16.71
Forfeited	(109	)	24.24
Outstanding at December 31, 2015	2,688		22.89		6.9	$	23,418
Exercisable at December 31, 2015	1,399		17.74		5.1	18,716
Vested and expected to vest at December 31, 2015 and thereafter	2,648		22.78		6.9	$	23,332

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, 2014	399		$	24.00	1.5
Granted (Awarded)	256		31.44
Vested (Released)	(196	)	23.99
Forfeited	(42	)	24.65
Non-vested at December 31, 2015	417		28.49		1.6	$	12,948

Restricted Stock Units Award 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, 2014	36		$	26.47
Granted (Awarded)	36		36.05
Vested (Released)	(41	)	26.48
Forfeited	—		—
Non-vested at December 31, 2015	31		$	35.97

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)
Unvested at December 31, 2014	233		$	17.96
Granted (Awarded)	60		29.56
Vested (Released)	(107	)	18.20
Forfeited	(35	)	14.08
Unvested at December 31, 2015	151		$	23.33

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, 2015:

	Number of Shares
	(In thousands)
Share options outstanding	2,688
Non-vested restricted stock awards	599
Shares authorized for future issuance	3,804
ESPP shares available for future issuance	3,251
Total shares reserved for future issuance	10,342