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Stock Plans (Tables) | 12 Months Ended
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Dec. 31, 2022
Stock Plans |
Schedule of stock options activity |
|  | Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (thousands)
Balance at December 31, 2021 (1,466,983 shares exercisable) |  | 4,309,201 |  |  | $ | 102.19 |  |  |  |  |
Granted |  | 622,722 |  |  | $ | 90.31 |  |  |  |  |
Exercised |  | (197,184 | ) |  | $ | 30.11 |  |  |  |  |
Forfeited/Canceled |  | (30,316 | ) |  | $ | 125.52 |  |  |  |  |
Expired |  | (1,018 | ) |  | $ | 23.63 |  |  |  |  |
Balance at December 31, 2022 |  | 4,703,405 |  |  | $ | 103.51 |  |  | 6.9 |  | $ | 26,045 |
Exercisable at December 31, 2022 |  | 1,514,504 |  |  | $ | 91.88 |  |  | 4.4 |  | $ | 23,497 |
Vested and expected to vest at December 31, 2022 |  | 4,207,661 |  |  | $ | 95.72 |  |  | 6.0 |  | $ | 25,584 |
Schedule of the fair value using the Black-Scholes-Merton option-pricing model |
|  | Year ended December 31,
|  | 2022 |  | 2021 |  | 2020
Volatility |  | 42.4 | % |  | 39.3 | % |  | 35.6 | %
Risk-free interest rate - weighted average |  | 3.97 | % |  | 1.2 | % |  | 0.6 | %
Risk-free interest rate - range |  | 3.45% to 3.97 | % |  | 0.50% to 1.21 | % |  | 0.31% to 1.17 | %
Dividend yield |  | — | % |  | — | % |  | — | %
Assumed forfeitures |  | 8.0 | % |  | 8.0 | % |  | 8.0 | %
Expected lives |  | 4.6 years |  |  | 4.6 years |  |  | 7.1 years |
Weighted-average fair value (per option) |  | $ | 37.15 |  |  | $ | 39.99 |  |  | $ | 48.21 |
Schedule of restricted stock activity |
|  | Number of Shares |  | Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2021 |  | 535,104 |  |  | $ | 127.96 |
Granted |  | 270,124 |  |  | $ | 91.47 |
Vested |  | (90,986 | ) |  | $ | 39.99 |
Forfeited |  | (37,807 | ) |  | $ | 117.01 |
Nonvested at December 31, 2022 |  | 676,435 |  |  | $ | 115.36 |

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