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Employee Benefits and Share-Based Compensation (Tables) | 12 Months Ended
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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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