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

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