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Employee Benefits and Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2015
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 our Condensed Consolidated Statements of Operations:
| Three Months Ended |  | Six Months Ended
| June 30, 2015 |  | June 30, 2014 |  | June 30, 2015 |  | June 30, 2014
| (In thousands)
Cost of product and service revenues | $ | 532 |  |  | $ | 264 |  |  | $ | 1,049 |  |  | $ | 532 |
Research and development | 451 |  |  | 380 |  |  | 885 |  |  | 749 |
Selling, general and administrative | 2,653 |  |  | 2,076 |  |  | 5,367 |  |  | 4,168 |
Total share-based compensation expense | $ | 3,636 |  |  | $ | 2,720 |  |  | $ | 7,301 |  |  | $ | 5,449 |
Estimate of Fair Value of Share-Based Awards, Employee Stock Purchase Plan | The following weighted average assumptions are used to value share options and Employee Stock Purchase Plan ("ESPP") shares issued pursuant to our equity incentive plans for the three and six months ended June 30, 2015 and June 30, 2014:
| Three Months Ended |  | Six Months Ended
| June 30, 2015 |  | June 30, 2014 |  | June 30, 2015 |  | June 30, 2014
| (In thousands)
Stock Option Plans |  |  |  |  |  |  |
Expected life, years | 5.04 |  |  | 4.77 |  |  | 5.04 |  |  | 4.79 |
Expected volatility, % | 29.3 | % |  | 35.9 | % |  | 32.2 | % |  | 35.4 | %
Risk free interest rate, % | 1.51 | % |  | 1.62 | % |  | 1.58 | % |  | 1.52 | %
Estimated forfeiture rate % | 2.5 | % |  | 2.5 | % |  | 2.5 | % |  | 2.5 | %
Dividend yield, % | — | % |  | — | % |  | — | % |  | — | %
| Three Months Ended |  | Six Months Ended
| June 30, 2015 |  | June 30, 2014 |  | June 30, 2015 |  | June 30, 2014
| (In thousands)
Employee Stock Purchase Plan |  |  |  |  |  |  |
Expected life, years | 0.5-2.0 |  |  | 0.5-2.0 |  |  | 0.5-2.0 |  |  | 0.5-2.0 |
Expected volatility, % | 28.52%-37.53% |  |  | 29.56%-39.84% |  |  | 23.75%-35.67% |  |  | 29.56%-39.84% |
Risk free interest rate, % | 0.03%-0.72% |  |  | 0.03%-0.53% |  |  | 0.03%-0.72% |  |  | 0.03%-0.53% |
Estimated forfeiture rate % | — | % |  | — | % |  | — | % |  | — | %
Dividend yield, % | — | % |  | — | % |  | — | % |  | — | %
Estimate of Fair Value of Share-Based Awards, Stock Options | The following weighted average assumptions are used to value share options and Employee Stock Purchase Plan ("ESPP") shares issued pursuant to our equity incentive plans for the three and six months ended June 30, 2015 and June 30, 2014:
| Three Months Ended |  | Six Months Ended
| June 30, 2015 |  | June 30, 2014 |  | June 30, 2015 |  | June 30, 2014
| (In thousands)
Stock Option Plans |  |  |  |  |  |  |
Expected life, years | 5.04 |  |  | 4.77 |  |  | 5.04 |  |  | 4.79 |
Expected volatility, % | 29.3 | % |  | 35.9 | % |  | 32.2 | % |  | 35.4 | %
Risk free interest rate, % | 1.51 | % |  | 1.62 | % |  | 1.58 | % |  | 1.52 | %
Estimated forfeiture rate % | 2.5 | % |  | 2.5 | % |  | 2.5 | % |  | 2.5 | %
Dividend yield, % | — | % |  | — | % |  | — | % |  | — | %
| Three Months Ended |  | Six Months Ended
| June 30, 2015 |  | June 30, 2014 |  | June 30, 2015 |  | June 30, 2014
| (In thousands)
Employee Stock Purchase Plan |  |  |  |  |  |  |
Expected life, years | 0.5-2.0 |  |  | 0.5-2.0 |  |  | 0.5-2.0 |  |  | 0.5-2.0 |
Expected volatility, % | 28.52%-37.53% |  |  | 29.56%-39.84% |  |  | 23.75%-35.67% |  |  | 29.56%-39.84% |
Risk free interest rate, % | 0.03%-0.72% |  |  | 0.03%-0.53% |  |  | 0.03%-0.72% |  |  | 0.03%-0.53% |
Estimated forfeiture rate % | — | % |  | — | % |  | — | % |  | — | %
Dividend yield, % | — | % |  | — | % |  | — | % |  | — | %
Stock Option Activity under the 2009 Plan | The following table summarizes the share option activity under the Company’s equity incentive plans during the six months ended June 30, 2015:
| Number of Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Years |  | Aggregate Intrinsic Value(1)
| (In thousands, except per share data)
Stock Options |  |  |  |  |  |  |
Outstanding at December 31, 2014 | 2,672 |  |  | $ | 19.02 |  |  | 6.5 |  |
Granted | 200 |  |  | 34.10 |  |  |  |  |
Exercised | (340 | ) |  | 15.54 |  |  |  |  |
Expired | (2 | ) |  | 15.57 |  |  |  |  |
Forfeited | (67 | ) |  | 23.30 |  |  |  |  |
Outstanding at June 30, 2015 | 2,463 |  |  | $ | 20.60 |  |  | 6.5 |  | $ | 42,138 |
Exercisable at June 30, 2015 | 1,425 |  |  | $ | 16.46 |  |  | 4.9 |  | $ | 30,277 |
Vested and expected to vest at June 30, 2015 | 2,435 |  |  | $ | 20.50 |  |  | 6.4 |  | $ | 41,919 |
_________________________________________________
(1) | Intrinsic value is calculated as the difference between the market value or closing price of our common stock as of the last trading day of the year as reported by the NASDAQ Global Select Market, and the exercise price of the option.
Restricted Stock Units Activity under the 2009 Plan | Restricted stock activity under the Company’s equity incentive plans in the six months ended June 30, 2015 is as follows:
| 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 (RSUs) |  |  |  |  |  |  |
Outstanding at December 31, 2014 | 399 |  |  | $ | 24.00 |  |  | 1.5 |  |
Granted | 65 |  |  | 34.19 |  |  |  |  |
Vested | (77 | ) |  | 21.57 |  |  |  |  |
Forfeited | (23 | ) |  | 22.35 |  |  |  |  |
Outstanding and unvested at June 30, 2015 | 364 |  |  | $ | 26.45 |  |  | 1.3 |  | $ | 13,714 |
Expected to vest at June 30, 2015 | 353 |  |  |  |  | 1.3 |  | $ | 13,329 |
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 (RSAs) |  |  |
Outstanding at December 31, 2014 | 36 |  |  | $ | 26.47 |
Granted | 37 |  |  | 36.05 |
Vested | (41 | ) |  | 26.47 |
Forfeited | (1 | ) |  | 27.65 |
Outstanding and unvested at June 30, 2015 | 31 |  |  | $ | 35.95 |
Performance Shares Restricted Stock Activity under the 2009 Plan | Performance-based restricted stock activity under the Company’s equity incentive plans in the six months ended June 30, 2015 is as follows:
| Number of Shares |  | Weighted-Average Grant Date Fair Value Per Unit
| (In thousands, except per share data)
Performance-based Restricted Stock Units (PSUs) |  |  |
Outstanding at December 31, 2014 | 233 |  |  | $ | 17.96 |
Granted | 60 |  |  | 29.56 |
Vested | (70 | ) |  | 18.91 |
Forfeited | (27 | ) |  | 14.69 |
Outstanding and unvested at June 30, 2015 | 196 |  |  | $ | 21.63 |
Shares Reserved for Future Issuance | We had the following ordinary shares reserved for future issuance under its equity incentive plans as of June 30, 2015:
| Number of Shares
| (In thousands)
Share options outstanding | 2,463 |
Restricted share awards outstanding | 559 |
Shares authorized for future issuance | 4,637 |
ESPP shares available for future issuance | 3,393 |
Total shares reserved for future issuance as of June 30, 2015 | 11,052 |

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