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Employee Benefits and Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 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 Income:
| Three Months Ended
| March 31, 2015 |  | March 31, 2014
| (In thousands)
Cost of product and service revenues | $ | 517 |  |  | $ | 268 |
Research and development | 434 |  |  | 369 |
Selling, general and administrative | 2,714 |  |  | 2,092 |
Total share-based compensation expense | $ | 3,665 |  |  | $ | 2,729 |
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(1)
| (In thousands, except per share data)
Outstanding at December 31, 2014 | 2,672 |  |  | $ | 19.02 |  |  | 6.5 |  |
Granted | 151 |  |  | 33.73 |  |  |  |  |
Exercised | (132 | ) |  | 15.69 |  |  |  |  |
Expired | — |  |  | — |  |  |  |  |
Forfeited | (16 | ) |  | 22.60 |  |  |  |  |
Outstanding at March 31, 2015 | 2,675 |  |  | $ | 19.98 |  |  | 6.6 |  | $ | 40,442 |
Exercisable at March 31, 2015 | 1,529 |  |  | $ | 16.11 |  |  | 5.0 |  | $ | 29,042 |
Vested and expected to vest at March 31, 2015 | 2,643 |  |  | $ | 19.88 |  |  | 6.5 |  | $ | 40,234 |
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(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 | A summary of the restricted stock activity under the 2009 Plan is 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 |  |  |  |  |  |  |
Outstanding at December 31, 2014 | 399 |  |  | $ | 24.00 |  |  | 1.5 |  |
Granted | 44 |  |  | 33.97 |  |  |  |  |
Vested | (26 | ) |  | 22.07 |  |  |  |  |
Forfeited | (6 | ) |  | 21.73 |  |  |  |  |
Outstanding and unvested at March 31, 2015 | 411 |  |  | $ | 25.21 |  |  | 1.4 |  | $ | 14,431 |
Expected to vest at March 31, 2015 | 399 |  |  |  |  | 1.4 |  | $ | 13,997 |
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 |  |  |
Outstanding at December 31, 2014 | 36 |  |  | $ | 17.49 |
Granted | — |  |  | — |
Vested | — |  |  | — |
Forfeited | — |  |  | — |
Outstanding and unvested at March 31, 2015 | 36 |  |  | $ | 17.49 |
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 | 60 |  |  | 29.56 |
Vested | (33 | ) |  | 21.26 |
Cancelled | — |  |  | — |
Unvested at March 31, 2015 | 260 |  |  | $ | 20.23 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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