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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock-based Compensation Expense | Stock-based compensation expense by income statement caption and the related income tax benefit were as follows:
| Three Months Ended March 31,
(In thousands) | 2016 |  | 2015
Cost of sales | $ | 14 |  |  | $ | 9 |
Research and development expenses | 136 |  |  | 105 |
Selling, general and administrative expenses: |  |  |
Employees | 1,845 |  |  | 1,471 |
Outside directors | 498 |  |  | 374 |
Total stock-based compensation expense | $ | 2,493 |  |  | $ | 1,959 |
Income tax benefit | $ | 733 |  |  | $ | 560 |
Schedule of Stock Option Activity | Stock option activity was as follows:
| Number of Options (in 000's) |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in 000's)
Outstanding at December 31, 2015 | 648 |  |  | $ | 30.50 |  |  |  |  |
Granted | 244 |  |  | 49.67 |  |  |  |  |
Exercised | (77 | ) |  | 25.25 |  |  |  |  | $ | 2,415 |
Forfeited/canceled/expired | — |  |  | — |  |  |  |  |
Outstanding at March 31, 2016 (1) | 815 |  |  | $ | 36.72 |  |  | 5.36 |  | $ | 20,847 |
Vested and expected to vest at March 31, 2016 (1) | 814 |  |  | $ | 36.72 |  |  | 5.36 |  | $ | 20,840 |
Exercisable at March 31, 2016 (1) | 469 |  |  | $ | 27.15 |  |  | 4.57 |  | $ | 16,422 |
(1) | The aggregate intrinsic value represents the total pre-tax value (the difference between our closing stock price on the last trading day of the first quarter of 2016 and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had they all exercised their options on March 31, 2016. This amount will change based on the fair market value of our stock.
Schedule of Black Scholes Assumptions | The assumptions we utilized in the Black-Scholes option pricing model and the resulting weighted average fair value of stock option grants were the following:
| Three Months Ended March 31,
| 2016 |  | 2015
Weighted average fair value of grants | $ | 17.96 |  |  | $ | 24.77 |
Risk-free interest rate | 1.36 | % |  | 1.38 | %
Expected volatility | 41.38 | % |  | 43.50 | %
Expected life in years | 4.55 |  |  | 4.56 |
Schedule of Non-vested Restricted Stock Awards Activity | Non-vested restricted stock award activity was as follows:
| Shares (in 000's) |  | Weighted-Average Grant Date Fair Value
Non-vested at December 31, 2015 | 225 |  |  | $ | 51.31 |
Granted | 37 |  |  | 51.39 |
Vested | (28 | ) |  | 45.92 |
Forfeited | (2 | ) |  | 55.85 |
Non-vested at March 31, 2016 | 232 |  |  | $ | 51.95 |

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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 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: 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 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + 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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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