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Stock-Based Compensation Stock-Based Compensation | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | Stock-Based Compensation Stock-based compensation expense for each employee and director is presented in the same income statement caption as their cash compensation. Stock-based compensation expense by income statement caption and the related income tax benefit were as follows:
| Year Ended December 31,
(In thousands) | 2015 |  | 2014 |  | 2013
Cost of sales | $ | 39 |  |  | $ | 16 |  |  | $ | 1 |
Research and development | 428 |  |  | 323 |  |  | 226 |
Selling, general and administrative: |  |  |  |  |
Employees | 5,946 |  |  | 4,927 |  |  | 4,494 |
Outside directors | 1,500 |  |  | 1,178 |  |  | 621 |
Total stock-based compensation expense | $ | 7,913 |  |  | $ | 6,444 |  |  | $ | 5,342 |
Income tax benefit | $ | 2,366 |  |  | $ | 1,897 |  |  | $ | 1,575 |
Stock Options 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,
| 2015 |  | 2014 |  | 2013
Weighted average fair value of grants | $ | 24.47 |  |  | $ | 13.64 |  |  | $ | 9.26 |
Risk-free interest rate | 1.39 | % |  | 1.29 | % |  | 0.95 | %
Expected volatility | 43.36 | % |  | 44.84 | % |  | 53.39 | %
Expected life in years | 4.57 |  |  | 4.56 |  |  | 5.20 |
Stock option activity was as follows:
| 2015 |  | 2014 |  | 2013
| Number of Options (in 000's) | Weighted-Average Exercise Price | Weighted-Average Remaining Contractual Terms (in years) | Aggregate Intrinsic Value (in 000's) |  | Number of Options (in 000's) | Weighted-Average Exercise Price | Weighted-Average Remaining Contractual Terms (in years) | Aggregate Intrinsic Value (in 000's) |  | Number of Options (in 000's) | Weighted-Average Exercise Price | Weighted-Average Remaining Contractual Terms (in years) | Aggregate Intrinsic Value (in 000's)
Outstanding at beginning of the year | 650 |  | $ | 25.56 |  |  |  |  | 924 |  | $ | 22.04 |  |  |  |  | 1,412 |  | $ | 20.56 |  |  |
Granted | 77 |  | 64.81 |  |  |  |  | 133 |  | 35.28 |  |  |  |  | 201 |  | 19.68 |  |  |
Exercised | (71 | ) | 23.97 |  |  | $ | 2,193 |  |  | (391 | ) | 20.76 |  |  | $ | 10,651 |  |  | (679 | ) | 18.22 |  |  | $ | 8,355 |
Forfeited/canceled/expired | (8 | ) | 20.64 |  |  |  |  | (16 | ) | 20.77 |  |  |  |  | (10 | ) | 24.75 |  |  |
Outstanding at end of the year (1) | 648 |  | $ | 30.50 |  | 4.85 | $ | 14,556 |  |  | 650 |  | $ | 25.56 |  | 5.59 | $ | 25,653 |  |  | 924 |  | $ | 22.04 |  | 6.09 | $ | 14,854 |
Vested and expected to vest at the end of the year (1) | 648 |  | $ | 30.50 |  | 4.85 | $ | 14,551 |  |  | 649 |  | $ | 25.57 |  | 5.58 | $ | 25,618 |  |  | 921 |  | $ | 22.05 |  | 6.08 | $ | 14,791 |
Exercisable at the end of the year (1) | 493 |  | $ | 25.03 |  | 4.51 | $ | 12,979 |  |  | 421 |  | $ | 23.84 |  | 4.87 | $ | 17,345 |  |  | 671 |  | $ | 22.62 |  | 5.14 | $ | 10,388 |
(1) | The aggregate intrinsic value represents the total pre-tax value (the difference between our closing stock price on the last trading day of 2015, 2014, and 2013 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, 2015, 2014, and 2013. This amount will change based on the fair market value of our stock.
During the years ended December 31, 2015, 2014, and 2013, there were no modifications made to outstanding stock options. Cash received from option exercises for the years ended December 31, 2015, 2014, and 2013 was $1.7 million, $8.1 million, and $12.4 million, respectively. The actual tax benefit realized from option exercises was $0.5 million, $3.1 million and $2.3 million for the years ended December 31, 2015, 2014, and 2013, respectively. Significant option groups outstanding at December 31, 2015 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 Years of Contractual Life |  | Weighted-Average Exercise Price |  | Number Exercisable (in 000’s) |  | Weighted-Average Exercise Price
$17.60 to $21.95 |  | 279 |  |  | 5.32 |  | $ | 20.23 |  |  | 257 |  |  | $ | 20.26 |
24.91 to 29.25 |  | 163 |  |  | 3.26 |  | 27.99 |  |  | 163 |  |  | 27.99 |
35.28 to 35.35 |  | 128 |  |  | 5.05 |  | 35.28 |  |  | 73 |  |  | 35.28 |
51.38 to 65.54 |  | 78 |  |  | 6.17 |  | 64.81 |  |  | — |  |  | — |
|  | 648 |  |  | 4.85 |  | $ | 30.50 |  |  | 493 |  |  | $ | 25.03 |
As of December 31, 2015, we expect to recognize $2.1 million of total unrecognized pre-tax stock-based compensation expense related to non-vested stock options over a remaining weighted-average life of 1.8 years. On January 1, 2016, certain executive employees were granted 93,135 stock options in connection with the 2015 annual review cycle. The options were granted as part of long-term incentive compensation to assist us in meeting our performance and retention objectives and are subject to a three-year vesting period (33.33% on January 1, 2017 and 8.33% each quarter thereafter). The total grant date fair value of these awards was $1.8 million. On February 10, 2016, members of the board of directors were granted 150,000 stock options. The options are subject to a three-year vesting period (33.33% per year beginning on February 10, 2017). The total grant date fair value of these awards was $2.6 million. Restricted Stock Non-vested restricted stock award activity was as follows:
| 2015 |  | 2014 |  | 2013
| Shares Granted (in 000’s) |  | Weighted-Average Grant Date Fair Value |  | Shares Granted (in 000’s) |  | Weighted-Average Grant Date Fair Value |  | Shares Granted (in 000’s) |  | Weighted-Average Grant Date Fair Value
Non-vested at beginning of the year | 266 |  |  | 39.28 |  |  | 285 |  |  | 24.64 |  |  | 270 |  |  | $ | 18.72 |
Granted | 138 |  |  | 53.64 |  |  | 155 |  |  | 51.29 |  |  | 196 |  |  | 28.86 |
Vested | (178 | ) |  | 35.09 |  |  | (171 | ) |  | 25.78 |  |  | (178 | ) |  | 20.44 |
Forfeited | (1 | ) |  | 63.19 |  |  | (3 | ) |  | 37.78 |  |  | (3 | ) |  | 15.49 |
Non-vested at end of the year | 225 |  |  | 51.31 |  |  | 266 |  |  | 39.28 |  |  | 285 |  |  | 24.64 |
As of December 31, 2015, we expect to recognize $10.7 million of total unrecognized pre-tax stock-based compensation expense related to non-vested restricted stock awards over a weighted-average life of 2.1 years. On January 1, 2016, certain executive employees were granted 34,060 restricted stock awards in connection with the 2015 annual review cycle. The awards were granted as part of long-term incentive compensation to assist us in meeting our performance and retention objectives and are subject to a three-year vesting period (33.33% on January 1, 2017 and 8.33% each quarter thereafter). The total grant date fair value of these awards was $1.8 million. Stock Incentive Plans Our active stock-based incentive plans include those adopted in 1998, 1999, 2002, 2003, 2006, 2010 and 2014 ("Stock Incentive Plans"). Under the Stock Incentive Plans, we may grant stock options, stock appreciation rights, restricted stock units, performance stock units, or any combination thereof for a period of ten years from the approval date of each respective plan, unless the plan is terminated by resolution of our Board of Directors. No stock appreciation rights or performance stock units have been awarded under our Stock Incentive Plans. Only directors and employees meeting certain employment qualifications are eligible to receive stock-based awards. The grant price of stock option and restricted stock awards granted under our Stock Incentive Plans is the average of the high and low trades of our stock on the grant date. We prohibit the re-pricing or backdating of stock options. Our stock options become exercisable in various proportions over a three- or four-year time frame. Stock options have a maximum ten-year term. Restricted stock awards vest in various proportions over a one- to three-year time period. Detailed information regarding our active Stock Incentive Plans was as follows at December 31, 2015:
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
1998 Stock Incentive Plan |  | 5/27/1998 |  | 630,000 |  |  | — |  |  | 3,400 |
1999A Stock Incentive Plan |  | 10/7/1999 |  | 1,000,000 |  |  | — |  |  | 20,500 |
2002 Stock Incentive Plan |  | 2/5/2002 |  | 1,000,000 |  |  | — |  |  | 480 |
2003 Stock Incentive Plan |  | 6/18/2003 |  | 1,000,000 |  |  | — |  |  | 63,241 |
2006 Stock Incentive Plan |  | 6/13/2006 |  | 1,000,000 |  |  | — |  |  | 196,357 |
2010 Stock Incentive Plan |  | 6/15/2010 |  | 1,000,000 |  |  | 13,219 |  |  | 379,673 |
2014 Stock Incentive Plan |  | 6/12/2014 |  | 1,100,000 |  |  | 821,820 |  |  | 209,180 |
|  |  |  |  |  | 835,039 |  |  | 872,831 |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51659978&loc=d3e25284-112666 Reference 3: 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=6415400&loc=d3e5070-113901 Reference 4: 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=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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