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Stock-Based Incentive Plans (Tables)
12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Allocation of Share Based Compensation Costs by Expense Category
Amounts of stock-based compensation recognized on our consolidated statements of income (loss), by expense category, are as follows (in thousands):
Year Ended December 31,
202120202019
Cost of goods sold$2,451 $1,898 $1,343 
Selling, general and administrative29,449 29,661 25,588 
Research and development8,664 3,530 5,622 
Total stock-based compensation expense40,564 35,089 32,553 
Income tax benefit588 992 6,590 
Total expense, net of income tax benefit$39,976 $34,097 $25,963 
Schedule of Allocation of Share-Based Compensation Costs by Type of Arrangement
Amounts of stock-based compensation expense recognized on our consolidated statements of income (loss), by type of arrangement, are as follows (in thousands):
Year Ended December 31,
202120202019
Service-based restricted stock units$19,614 $18,320 $14,113 
Service-based stock appreciation rights12,489 12,715 10,349 
Market performance-based restricted stock units3,522 3,200 2,900 
Operating performance-based restricted stock units 3,434 (370)3,918 
Employee stock purchase plan1,505 1,224 1,273 
Total stock-based compensation expense from continuing operations$40,564 $35,089 $32,553 
Schedule of Stock-Based Compensation Costs Unrecognized
Amounts of stock-based compensation cost not yet recognized related to non-vested awards, including awards assumed or issued, as of December 31, 2021, are as follows (in thousands):
 Unrecognized Compensation CostWeighted Average Remaining Vesting Period (in years)
Service-based stock appreciation rights$25,025 2.59
Service-based restricted stock unit awards35,770 2.46
Performance-based restricted stock unit awards11,208 2.03
Total stock-based compensation cost unrecognized$72,003 2.36
Schedule of Stock Options Valuation Assumptions The following table lists the assumptions we utilized as inputs to the Black-Scholes model:
Year Ended December 31,
 202120202019
Dividend yield (1)
Risk-free interest rate (2)
1.0%0.4%1.4 %-2.2 %
Expected option term - in years (3)
5.65.45.0-5.1
Expected volatility at grant date (4)
42.1%39.5%32.2 %-35.7 %
(1)We have not paid dividends and no future dividends have been approved. 
(2)We use yield rates on U.S. Treasury securities for a period that approximates the expected term of the awards granted to estimate the risk-free interest rate.
(3)We estimated the expected term of the awards granted using historic data of actual time elapsed between the date of grant and the exercise or forfeiture of options or SARs for employees.
(4)We determine the expected volatility of the awards based on historical volatility.
Schedule of Stock Option Activity
The following tables detail the activity for service-based SARs and stock option awards:
SARs and Stock OptionsNumber of Optioned SharesWtd. Avg. Exercise Price per ShareWtd. Avg. Remaining Contractual Term (years)
Aggregate Intrinsic Value (in thousands) (1)
Outstanding — at December 31, 20202,884,020 $63.20   
Granted594,617 $73.25   
Exercised(424,122)$52.95   
Forfeited(291,534)$62.36   
Expired(128,608)$88.67   
Outstanding — at December 31, 20212,634,373 $65.94 7.2$61,693 
Fully vested and exercisable — end of year1,154,459 $68.18 5.6$25,149 
Fully vested and expected to vest — end of year (2)
2,579,659 $66.01 7.1$60,305 
(1)The aggregate intrinsic value of SARs and options is based on the difference between the fair market value of the underlying stock at December 31, 2021, using the market closing stock price, and exercise price for in-the-money awards.
(2)Includes the impact of expected future forfeitures.
Year Ended December 31,
202120202019
Weighted average grant date fair value of SARs granted during the year (per share)$29.22 $15.73 $31.22 
Aggregate intrinsic value of SARs and stock options exercised during the year (in thousands)$12,223 $773 $2,064 
Summary of Restricted Stock Service-Based Activity
The following tables detail the activity for service-based RSU awards:
RSUsNumber of SharesWtd. Avg. Grant Date Fair Value
Non-vested shares at December 31, 2020848,459 $58.00 
Granted363,372 $74.17 
Vested(279,064)$61.82 
Forfeited(141,610)$55.85 
Non-vested shares at December 31, 2021791,157 $64.53 
Year Ended December 31,
202120202019
Weighted average grant date fair value of service-based RSUs issued during the year (per share)$74.17 $44.28 $92.54 
Aggregate fair value of RSUs that vested during the year (in thousands)$21,501 $13,674 $12,710 
Summary of Performance-Based Restricted Stock and Restricted Stock Unit Activity
The following tables detail the activity for performance-based and market-based RSU awards:
Performance-based and market-based RSUsNumber of SharesWtd. Avg. Grant Date Fair Value
Non-vested shares at December 31, 2020380,799 $56.55 
Granted123,956 $89.29 
Vested(107,455)$67.09 
Forfeited(51,356)$28.42 
Non-vested shares at December 31, 2021345,944 $68.36 
Year Ended December 31,
202120202019
Weighted average grant date fair value of performance and market-based restricted share units granted during the year (per share)$89.29 $41.70 $98.50 
Aggregate fair value of performance and market-based restricted share units that vested during the year (in thousands)$8,268 $4,106 $6,697