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Employee Benefits and Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation Expense Recognized in Consolidated 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,
| 2018 |  | 2017 |  | 2016
| (In thousands)
Cost of product and service revenues | $ | 4,634 |  |  | $ | 3,478 |  |  | $ | 2,596 |
Research and development | 5,746 |  |  | 3,590 |  |  | 3,128 |
Selling, general, and administrative | 18,505 |  |  | 14,789 |  |  | 13,776 |
Total share-based compensation expense | $ | 28,885 |  |  | $ | 21,857 |  |  | $ | 19,500 |
Estimate of Fair Value of Share-Based Awards, Stock Options | The following assumptions were used to value stock options and ESPP shares granted pursuant to the Company’s equity incentive plans for the years ended December 31, 2018, December 31, 2017, and December 31, 2016:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Stock options |  |  |  |  |
Expected life, years | 4.8 |  |  | 4.7 |  |  | 4.9 |
Expected volatility, % | 31.1 | % |  | 29.6 | % |  | 30.6 | %
Risk-free interest rate, % | 2.8 | % |  | 1.9 | % |  | 1.5 | %
Estimated forfeiture rate, % | 6.9 | % |  | 7.7 | % |  | 8.6 | %
Dividend yield, % | — | % |  | — | % |  | — | %
Estimate of Fair Value of Share-Based Awards, Employee Stock Purchase Plan |
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Employee stock purchase plan shares |  |  |  |  |
Expected life, years | 0.5 - 2.0 |  |  | 0.5 - 2.0 |  |  | 0.5 - 2.0 |
Expected volatility, % | 28.1% - 33.8% |  |  | 25.8% - 32.8% |  |  | 25.8% - 34.8% |
Risk-free interest rate, % | 0.8% - 2.7% |  |  | 0.5% - 1.4% |  |  | 0.3% - 0.8% |
Dividend yield, % | — | % |  | — | % |  | — | %
Stock Option Activity under the 2009 Plan | The following table summarizes the share option activity under the Company’s 2009 Plan during the year ended December 31, 2018:
| Number of Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Years |  | Aggregate Intrinsic Value
| (In thousands, except per share data)
Outstanding at December 31, 2017 | 3,323 |  |  | $ | 32.72 |  |  | 7.6 |  | $ | 53,953 |
Granted | 1,359 |  |  | 54.00 |  |  |  |  |
Exercised | (672 | ) |  | 25.68 |  |  |  |  |
Expired | (16 | ) |  | 26.54 |  |  |  |  |
Forfeited | (246 | ) |  | 39.60 |  |  |  |  |
Outstanding at December 31, 2018 | 3,748 |  |  | $ | 41.27 |  |  | 7.6 |  | $ | 78,365 |
Exercisable at December 31, 2018 | 1,397 |  |  | 29.69 |  |  | 5.7 |  | 44,084 |
Vested and expected to vest at December 31, 2018 and thereafter | 3,532 |  |  | $ | 40.64 |  |  | 7.6 |  | $ | 75,823 |
Restricted Stock Units Activity under the 2009 Plan | Summaries of the restricted stock activity under the 2009 Plan are presented below for the year ended December 31, 2018:
| 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 |  |  |  |  |  |  |
Outstanding at December 31, 2017 | 501 |  |  | $ | 38.90 |  |  | 1.5 |  | $ | 24,293 |
Granted (Awarded) | 312 |  |  | 59.52 |  |  |  |  |
Vested (Released) | (213 | ) |  | 37.14 |  |  |  |  |
Forfeited | (62 | ) |  | 39.00 |  |  |  |  |
Outstanding and unvested at December 31, 2018 | 538 |  |  | $ | 51.52 |  |  | 1.6 |  | $ | 32,935 |
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 |  |  |
Outstanding at December 31, 2017 | 23 |  |  | $ | 41.07 |
Granted (Awarded) | 21 |  |  | 46.60 |
Vested (Released) | (23 | ) |  | 41.07 |
Outstanding and unvested at December 31, 2018 | 21 |  |  | $ | 46.60 |
Restricted Stock Activity (Performance based) under the 2009 Plan | A summary of the performance-based restricted stock activity under the 2009 Plan is presented below for the year ended December 31, 2018:
| Number of Shares |  | Weighted-Average Grant Date Fair Value Per Unit
| (In thousands, except per share data)
Outstanding at December 31, 2017 | 225 |  |  | $ | 31.18 |
Granted | 110 |  |  | 38.03 |
Vested | (106 | ) |  | 30.54 |
Forfeited | (32 | ) |  | 34.47 |
Outstanding and unvested at December 31, 2018 | 197 |  |  | $ | 34.83 |
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, 2018:
| Number of Shares
| (In thousands)
Share options outstanding | 3,748 |
Non-vested restricted stock awards | 755 |
Shares authorized for future issuance | 2,431 |
ESPP shares available for future issuance | 1,913 |
Total shares reserved for future issuance | 8,847 |

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