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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule Of Restricted Stock Units
The following is a summary of RSU activity during the year ended December 31, 2021:
(In thousands except per share data)UnitsWeighted-Average
Grant-Date
Fair Value
Unvested at January 1, 2021472 $145.77 
Granted229 194.41 
Vested, including 55 shares withheld for tax1
(175)139.08 
Forfeited(41)169.13 
Unvested at December 31, 2021485 $169.19 
1 The Company withholds shares of common stock to pay the minimum required statutory taxes due upon RSU vesting. Cash is then remitted by the Company to the appropriate taxing authorities.
Schedule Of Assumptions Used, Options The key inputs for the fair values and other relevant information by grant date are outlined below:
Grant date3/15/20216/24/2020
6/24/20202
3/16/20203
3/20/20193
Risk-free interest rate0.29%0.21%0.21%0.20%0.18%
Stock price1
$226.02$160.14$160.14$173.15$173.15
Expected stock price volatility53.65%47.72%47.72%51.32%62.29%
Weighted-average fair value per share1
$238.92$264.17$240.55$280.93$188.21
1 At the date of grant or modification date, whichever is applicable.
2 CEO-only award; Has a one-year post-vesting holding period.
3 Awards modified on June 23, 2020.
The fair value of option awards is estimated on the grant date using the Black-Scholes-Merton option-pricing model utilizing the assumptions included in the following table:
202120202019
Weighted average grant date fair value$92.82 $35.13 $58.28 
Weighted average expected term (in years)666
Weighted average exercise price$226.02 $109.66 $184.81 
Expected stock price volatility41.81 %32.37 %27.21 %
Risk-free interest rate1.05 %0.58 %2.37 %
Schedule Of Performance Based Restricted Stock Units
The following is a summary of PBRSU activity during the year ended December 31, 2021:
(In thousands except per share data)SharesWeighted-Average
Grant-Date
Fair Value
Unvested at January 1, 2021582 $170.05 
Granted148 236.44 
Forfeited(56)219.29 
Vested, including 54 shares withheld for tax1
(150)157.55 
Performance adjustment2, 3
33 NM
Unvested at December 31, 20213
557 $230.01 
NM - Not meaningful
1 The Company withholds shares of common stock to pay the minimum required statutory taxes due upon PBRSU vesting. Cash is then remitted by the Company to the appropriate taxing authorities.
2 Reflects adjustments to the number of shares of PBRSUs expected to vest based on the change in estimated performance attainments during the year ended December 31, 2021.
3 The impact on awards as a result of expected market condition attainments is not reflected in this table until the attainment measurement period concludes.
Schedule Of Stock Option Activity
The following is a summary of all stock option activity during the year ended December 31, 2021: 
(In thousands, except per share data)SharesWeighted-Average Exercise PriceWeighted-Average Remaining Contractual Term (in years)Aggregate Intrinsic Value
Outstanding at January 1, 20211,043 $115.72 
Granted119 226.02 
Exercised(432)102.40 
Forfeited or expired(26)147.28 
Outstanding at December 31, 2021704 $141.42 7.1$14,850 
Exercisable on December 31, 2021399 $125.95 6.1$10,036 
Vested and expected to vest at December 31, 2021300 $161.14 8.5$4,768