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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock-based Compensation Expense | Stock-based compensation expense by statement of operations caption and the related income tax benefit were as follows:
| Year Ended December 31,
(In thousands) | 2017 |  | 2016 |  | 2015
Cost of sales | $ | 71 |  |  | $ | 57 |  |  | $ | 39 |
Research and development expenses | 551 |  |  | 541 |  |  | 428 |
Selling, general and administrative expenses: |  |  |  |  |
Employees | 7,368 |  |  | 7,095 |  |  | 5,946 |
Outside directors | 3,953 |  |  | 2,631 |  |  | 1,500 |
Total employee and director stock-based compensation expense | $ | 11,943 |  |  | $ | 10,324 |  |  | $ | 7,913 |
Income tax benefit | $ | 2,954 |  |  | $ | 3,102 |  |  | $ | 2,366 |
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:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Weighted average fair value of grants | $ | 19.61 |  |  | $ | 17.96 |  |  | $ | 24.47 |
Risk-free interest rate | 1.75 | % |  | 1.36 | % |  | 1.39 | %
Expected volatility | 34.25 | % |  | 41.38 | % |  | 43.36 | %
Expected life in years | 4.52 |  |  | 4.55 |  |  | 4.57 |
Schedule of Stock Option Activity | Stock option activity was as follows:
| 2017 |  | 2016 |  | 2015
| Number of Options (in 000's) | Weighted-Average Exercise Price | Weighted-Average Remaining Contractual Term (in years) | Aggregate Intrinsic Value (in 000's) |  | Number of Options (in 000's) | Weighted-Average Exercise Price | Weighted-Average Remaining Contractual Term (in years) | Aggregate Intrinsic Value (in 000's) |  | 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 beginning of the year | 652 |  | $ | 39.27 |  |  |  |  | 648 |  | $ | 30.50 |  |  |  |  | 650 |  | $ | 25.56 |  |  |
Granted | 92 |  | 62.70 |  |  |  |  | 243 |  | 49.67 |  |  |  |  | 77 |  | 64.81 |  |  |
Exercised | (56 | ) | 25.72 |  |  | $ | 2,140 |  |  | (239 | ) | 26.09 |  |  | $ | 9,933 |  |  | (71 | ) | 23.97 |  |  | $ | 2,193 |
Forfeited/canceled/expired | (168 | ) | 46.44 |  |  |  |  | — |  | — |  |  |  |  | (8 | ) | 20.64 |  |  |
Outstanding at end of the year (1) | 520 |  | $ | 42.56 |  | 4.25 | $ | 5,607 |  |  | 652 |  | $ | 39.27 |  | 4.78 | $ | 16,553 |  |  | 648 |  | $ | 30.50 |  | 4.85 | $ | 14,556 |
Vested and expected to vest at the end of the year (1) | 520 |  | $ | 42.56 |  | 4.25 | $ | 5,607 |  |  | 652 |  | $ | 39.27 |  | 4.78 | $ | 16,548 |  |  | 648 |  | $ | 30.50 |  | 4.85 | $ | 14,551 |
Exercisable at the end of the year (1) | 381 |  | $ | 36.39 |  | 3.72 | $ | 5,607 |  |  | 363 |  | $ | 30.21 |  | 3.88 | $ | 12,511 |  |  | 493 |  | $ | 25.03 |  | 4.51 | $ | 12,979 |
(1) | The aggregate intrinsic value represents the total pre-tax value (the difference between our closing stock price on the last trading day of 2017, 2016, and 2015 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 December 31, 2017, 2016, and 2015. This amount will change based on the fair market value of our stock.
Schedule of Exercise Price Range and Life Information | Significant option groups outstanding at December 31, 2017 and the related weighted average exercise price and life information were as follows:
|  | Options Outstanding |  | Options Exercisable
Range of Exercise Prices |  | Number Outstanding (in 000’s) |  | Weighted-Average Remaining Contractual Term (in years) |  | Weighted-Average Exercise Price |  | Number Exercisable (in 000’s) |  | Weighted-Average Exercise Price
$18.25 to $21.95 |  | 155 |  |  | 3.79 |  | $ | 19.92 |  |  | 155 |  |  | $ | 19.92 |
26.48 to 27.74 |  | 17 |  |  | 0.30 |  | 27.02 |  |  | 17 |  |  | 27.02 |
35.28 |  | 85 |  |  | 3.12 |  | 35.28 |  |  | 85 |  |  | 35.28 |
51.38 to 65.54 |  | 263 |  |  | 5.14 |  | 59.31 |  |  | 124 |  |  | 59.10 |
|  | 520 |  |  | 4.25 |  | $ | 42.56 |  |  | 381 |  |  | $ | 36.39 |
Schedule of Non-vested Restricted Stock Awards Activity | Non-vested restricted stock award activity was as follows:
| 2017 |  | 2016 |  | 2015
| Shares (in 000’s) |  | Weighted-Average Grant Date Fair Value |  | Shares (in 000’s) |  | Weighted-Average Grant Date Fair Value |  | Shares (in 000’s) |  | Weighted-Average Grant Date Fair Value
Non-vested at beginning of the year | 153 |  |  | $ | 57.43 |  |  | 225 |  |  | $ | 51.31 |  |  | 266 |  |  | $ | 39.28 |
Granted | 133 |  |  | 64.14 |  |  | 77 |  |  | 63.30 |  |  | 138 |  |  | 53.64 |
Vested | (119 | ) |  | 59.67 |  |  | (146 | ) |  | 51.10 |  |  | (178 | ) |  | 35.09 |
Forfeited | (5 | ) |  | 60.11 |  |  | (3 | ) |  | 60.17 |  |  | (1 | ) |  | 63.19 |
Non-vested at end of the year | 162 |  |  | $ | 61.19 |  |  | 153 |  |  | $ | 57.43 |  |  | 225 |  |  | $ | 51.31 |
Schedule of Information Regarding Stock Incentive Plans | Detailed information regarding our active Stock Incentive Plans was as follows at December 31, 2017:
Name |  | Approval Date |  | Initial Shares Available for Grant Under the Plan |  | Remaining Shares Available for Grant Under the Plan |  | Outstanding Shares Granted Under the Plan
1999A Stock Incentive Plan |  | 10/7/1999 |  | 1,000,000 |  |  | — |  |  | 7,500 |
2003 Stock Incentive Plan |  | 6/18/2003 |  | 1,000,000 |  |  | — |  |  | 14,391 |
2006 Stock Incentive Plan |  | 6/13/2006 |  | 1,000,000 |  |  | — |  |  | 82,572 |
2010 Stock Incentive Plan |  | 6/15/2010 |  | 1,000,000 |  |  | — |  |  | 203,303 |
2014 Stock Incentive Plan |  | 6/12/2014 |  | 1,100,000 |  |  | 448,051 |  |  | 373,673 |
|  |  |  |  |  | 448,051 |  |  | 681,439 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&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 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&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 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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