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Equity-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Stock Option Activity

Stock option activity during 2021, 2022 and 2023 was as follows:

 

 

 

Number of
Options

 

 

Weighted
Average
Exercise Price

 

 

Weighted
Average
Remaining
Contractual
Term (in years)

 

 

Aggregate
Intrinsic
Value (in thousands)

 

Options outstanding at January 1, 2021

 

 

1,510,306

 

 

$

37.56

 

 

 

 

 

 

 

Options granted

 

 

324,320

 

 

 

57.53

 

 

 

 

 

 

 

Options exercised

 

 

(558,322

)

 

 

39.45

 

 

 

 

 

 

 

Options cancelled

 

 

(170,235

)

 

 

40.08

 

 

 

 

 

 

 

Options outstanding at December 31, 2021

 

 

1,106,069

 

 

 

42.07

 

 

 

 

 

 

 

Options granted

 

 

334,260

 

 

 

55.73

 

 

 

 

 

 

 

Options exercised

 

 

(285,577

)

 

 

40.66

 

 

 

 

 

 

 

Options cancelled

 

 

(175,475

)

 

 

46.98

 

 

 

 

 

 

 

Options outstanding at December 31, 2022

 

 

979,277

 

 

 

46.27

 

 

 

 

 

 

 

Options granted

 

 

296,340

 

 

 

78.94

 

 

 

 

 

 

 

Options exercised

 

 

(198,527

)

 

 

41.29

 

 

 

 

 

 

 

Options cancelled

 

 

(140,545

)

 

 

55.95

 

 

 

 

 

 

 

Options outstanding at December 31, 2023

 

 

936,545

 

 

$

56.21

 

 

 

7.26

 

 

$

18,640

 

Options exercisable at December 31, 2023

 

 

349,080

 

 

$

42.85

 

 

 

5.51

 

 

$

11,155

 

Schedule of Stock Options Valuation Assumptions The following table summarizes the grant-date fair value of options and the assumptions used to develop the fair value estimates for options granted during the years ended December 31, 2023, 2022 and 2021:

 

 

 

Year Ended December 31,

 

 

 

2023

 

 

2022

 

 

2021

 

Weighted average grant-date fair value of options

 

$

30.99

 

 

$

20.72

 

 

$

20.64

 

Risk-free interest rate

 

 

4.2

%

 

 

2.0

%

 

 

0.9

%

Expected volatility

 

 

37

%

 

 

39

%

 

 

40

%

Expected life (in years)

 

 

5.0

 

 

 

5.0

 

 

 

5.0

 

Restricted Stock Unit Activity

Restricted stock unit activity during 2021, 2022 and 2023 was as follows:

 

 

 

Number of
Shares

 

 

Weighted
Average
Grant-Date
Fair Value

 

Unvested at January 1, 2021

 

 

1,022,996

 

 

$

28.41

 

Granted

 

 

352,430

 

 

 

58.32

 

Cancelled

 

 

(82,751

)

 

 

39.63

 

Vested

 

 

(366,048

)

 

 

30.81

 

Unvested at December 31, 2021

 

 

926,627

 

 

$

37.84

 

Granted

 

 

650,396

 

 

 

64.65

 

Cancelled

 

 

(145,205

)

 

 

49.03

 

Vested

 

 

(386,616

)

 

 

32.64

 

Unvested at December 31, 2022

 

 

1,045,202

 

 

$

54.89

 

Granted

 

 

587,239

 

 

 

76.32

 

Cancelled

 

 

(198,740

)

 

 

57.21

 

Vested

 

 

(403,223

)

 

 

50.48

 

Unvested at December 31, 2023

 

 

1,030,478

 

 

$

68.38

 

Performance Stock Unit Activity

Performance stock unit activity during 2021, 2022 and 2023 was as follows:

 

 

 

Number of
Units

 

 

Weighted
Average
Grant-Date
Fair Value

 

Unvested at January 1, 2021

 

 

1,073,062

 

 

$

20.15

 

Granted

 

 

149,416

 

 

 

61.52

 

Performance adjustment

 

 

465,993

 

 

 

25.49

 

Cancelled

 

 

 

 

 

 

Vested

 

 

(184,051

)

 

 

42.30

 

Unvested at December 31, 2021

 

 

1,504,420

 

 

$

23.20

 

Granted

 

 

105,311

 

 

 

73.96

 

Performance adjustment

 

 

182,543

 

 

 

33.05

 

Cancelled

 

 

 

 

 

 

Vested

 

 

(518,474

)

 

 

43.16

 

Unvested at December 31, 2022

 

 

1,273,800

 

 

$

20.69

 

Granted

 

 

177,509

 

 

 

70.98

 

Performance adjustment

 

 

407,825

 

 

 

17.69

 

Cancelled

 

 

(114,908

)

 

 

69.07

 

Vested

 

 

(1,408,195

)

 

 

10.60

 

Unvested at December 31, 2023

 

 

336,031

 

 

$

69.35