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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
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)202020192018
Cost of sales$182 $139 $84 
Research and development expenses1,099 1,096 744 
Selling, general and administrative expenses:
Employees
6,257 6,431 6,491 
Outside directors
1,584 1,179 1,501 
Total employee and director stock-based compensation expense$9,122 $8,845 $8,820 
Income tax benefit$1,594 $1,877 $1,870 
Assumptions Used and Weighted Average Fair Value of Stock Option Grants
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,
 202020192018
Weighted average fair value of grants$17.70 $11.51 $14.26 
Risk-free interest rate1.44 %2.38 %2.51 %
Expected volatility43.95 %41.73 %33.09 %
Expected life in years4.594.604.53
Stock Option Activity
Stock option activity was as follows:
202020192018
Number of Options
(in 000's)
Weighted-Average Exercise PriceWeighted-Average Remaining Contractual Term
(in years)
Aggregate Intrinsic Value
(in 000's)
Number of Options
(in 000's)
Weighted-Average Exercise PriceWeighted-Average Remaining Contractual Term
(in years)
Aggregate Intrinsic Value
(in 000's)
Number of Options
(in 000's)
Weighted-Average Exercise PriceWeighted-Average Remaining Contractual Term
(in years)
Aggregate Intrinsic Value
(in 000's)
Outstanding at beginning of the year745 $41.73 597 $44.27 520 $42.56 
Granted109 46.17 170 30.08 119 44.95 
Exercised(80)35.28 $1,334 (22)20.34 $569 (35)24.67 $744 
Forfeited/canceled/expired— — — — (7)27.74 
Outstanding at end of the year (1)
774 $43.01 3.71$9,228 745 $41.73 3.97$9,798 597 $44.27 4.08$758 
Vested and expected to vest at the end of the year (1)
774 $43.01 3.71$9,228 745 $41.73 3.97$9,798 597 $44.27 4.08$758 
Exercisable at the end of the year (1)
582 $43.90 2.98$6,887 517 $44.95 3.01$5,636 430 $42.30 3.43$758 
(1)The aggregate intrinsic value represents the total pre-tax value (the difference between our closing stock price on the last trading day of 2020, 2019, and 2018 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, 2020, 2019, and 2018. This amount will change based on the fair market value of our stock.
Significant Option Groups Outstanding and Related Weighted Average Exercise Price and Life Information
Significant option groups outstanding at December 31, 2020 and the related weighted average exercise price and life information were as follows:
 Options OutstandingOptions Exercisable
Range of Exercise PricesNumber
Outstanding
(in 000's)
Weighted-Average
Remaining 
Contractual Term (in years)
Weighted-Average
Exercise Price
Number
Exercisable
(in 000's)
Weighted-Average
Exercise Price
$19.25 to $27.07
263 3.72$23.83 200 $22.82 
$35.28 to $46.17
229 5.4445.47 113 44.84 
$51.38 to $65.54
282 2.6158.85 269 59.15 
774 3.71$43.01 582 $43.90 
Non-Vested Restricted Stock Awards Activity
Non-vested restricted stock award activity was as follows:
202020192018
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 year310 $34.99 204 $49.23 162 $61.19 
Granted238 36.85 268 30.67 167 42.65 
Vested(166)38.28 (141)47.26 (109)56.16 
Forfeited(8)43.44 (21)35.78 (16)54.16 
Non-vested at end of the year374 $34.53 310 $34.99 204 $49.23 
Detailed Information Regarding Active Stock Incentive Plans
Detailed information regarding our active Stock Incentive Plans was as follows at December 31, 2020:
NameApproval DateInitial Shares
Available for Grant
Under the Plan
Remaining Shares
Available for Grant
Under the Plan
Outstanding Shares
Granted
Under the Plan
2003 Stock Incentive Plan6/18/20031,000,000 — 14,391 
2006 Stock Incentive Plan6/13/20061,000,000 — 25,275 
2010 Stock Incentive Plan6/15/20101,000,000 — 123,131 
2014 Stock Incentive Plan6/12/20141,100,000 — 357,860 
2018 Equity and Incentive Compensation Plan6/4/20181,000,000 223,199 627,545 
223,199 1,148,202