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Employee Benefits and Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
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, 2016 |  | December 31, 2015 |  | December 31, 2014
Stock Option Plans |  |  |  |  |
Risk-free interest rate | 1.5 | % |  | 1.7 | % |  | 1.6 | %
Dividend yield | — | % |  | — | % |  | — | %
Expected volatility | 30.6 | % |  | 32.0 | % |  | 34.9 | %
Expected life (in years) | 4.9 years |  |  | 5.0 years |  |  | 4.8 years |
Estimate of Fair Value of Share-Based Awards, Employee Stock Purchase Plan |
| Year Ended
| December 31, 2016 |  | December 31, 2015 |  | December 31, 2014
Employee Stock Purchase Plan |  |  |  |  |
Risk-free interest rate | 0.34% - 0.79% |  |  | 0.03% - 0.79% |  |  | 0.03% - 0.53% |
Dividend yield | — | % |  | — | % |  | — | %
Expected volatility | 25.8% - 34.8% |  |  | 25.7% - 37.5% |  |  | 29.5% - 42.1% |
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, 2016 |  | December 31, 2015 |  | December 31, 2014
| (In thousands)
Cost of product and service revenues | $ | 2,596 |  |  | $ | 2,111 |  |  | $ | 1,456 |
Research and development | 3,128 |  |  | 2,060 |  |  | 1,655 |
Selling, general and administrative | 13,776 |  |  | 10,750 |  |  | 9,674 |
Total share-based compensation expense | $ | 19,500 |  |  | $ | 14,921 |  |  | $ | 12,785 |
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, 2015 | 2,688 |  |  | $ | 22.89 |  |  | 6.9 |  |
Granted (Awarded) | 1,055 |  |  | 32.11 |  |  |  |  |
Exercised (Released) | (406 | ) |  | 19.58 |  |  |  |  |
Expired | (8 | ) |  | 30.43 |  |  |  |  |
Forfeited | (115 | ) |  | 30.19 |  |  |  |  |
Outstanding at December 31, 2016 | 3,214 |  |  | 26.06 |  |  | 7.3 |  | $ | 26,331 |
Exercisable at December 31, 2016 | 1,487 |  |  | 20.23 |  |  | 5.4 |  | 20,459 |
Vested and expected to vest at December 31, 2016 and thereafter | 3,007 |  |  | 25.66 |  |  | 7.2 |  | $ | 25,778 |
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, 2015 | 417 |  |  | $ | 28.49 |  |  | 1.6 |  |
Granted (Awarded) | 289 |  |  | 32.58 |  |  |  |  |
Vested (Released) | (179 | ) |  | 26.83 |  |  |  |  |
Forfeited | (22 | ) |  | 28.37 |  |  |  |  |
Non-vested at December 31, 2016 | 505 |  |  | 31.42 |  |  | 1.6 |  | $ | 17,135 |
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, 2015 | 31 |  |  | $ | 35.97 |
Granted (Awarded) | 34 |  |  | 31.59 |
Vested (Released) | (35 | ) |  | 35.45 |
Forfeited | — |  | — |  | — |
Non-vested at December 31, 2016 | 30 |  |  | $ | 31.57 |
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, 2015 | 151 |  |  | $ | 23.33 |
Granted (Awarded) | 123 |  |  | 24.66 |
Vested (Released) | (90 | ) |  | 21.95 |
Forfeited | — |  |  | — |
Nov-vested at December 31, 2016 | 184 |  |  | $ | 24.89 |
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, 2016:
|  | Number of Shares
|  | (In thousands)
Share options outstanding |  | 3,214 |
Non-vested restricted stock awards |  | 719 |
Shares authorized for future issuance |  | 3,143 |
ESPP shares available for future issuance |  | 2,831 |
Total shares reserved for future issuance |  | 9,907 |

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