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Share-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2023
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Option Activity | The following table summarizes the Company’s stock option activity (in thousands, except per share data and years) for the three months ended March 31, 2023:
|  | Stock Options Outstanding |
|  |  |  |  | Weighted Average |  |  | Aggregate |  |  | Weighted Average |
|  |  |  |  | Exercise Price |  |  | Intrinsic |  |  | Remaining Contractual |
|  | Shares |  |  | Per Share |  |  | Value |  |  | Term (Years) |
Balance as of January 1, 2023 |  |  | 1,577 |  |  | $ | 288.30 |  |  |  |  |  |  |
Granted |  |  | 0 |  |  | $ | 0 |  |  |  |  |  |  |
Exercised |  |  | (44 | ) |  | $ | 151.51 |  |  | $ | 5,259 |  |  |  |
Forfeited/Expired |  |  | (13 | ) |  | $ | 477.02 |  |  |  |  |  |  |
Balance as of March 31, 2023 |  |  | 1,520 |  |  | $ | 290.79 |  |  |  |  |  |  |
Exercisable as of March 31, 2023 |  |  | 900 |  |  | $ | 236.00 |  |  | $ | 110,740 |  |  |  | 4.1 |
Expected to vest as of March 31, 2023 |  |  | 620 |  |  | $ | 370.35 |  |  | $ | 28,301 |  |  |  | 8.4 |
Total |  |  | 1,520 |  |  | $ | 290.79 |  |  | $ | 139,041 |  |  |  | 5.9 |
Schedule of Range of Exercise Prices per Share | Stock options outstanding as of March 31, 2023 are comprised of the following range of exercise prices per share (in thousands, except per share data and years):
|  | Stock Options Outstanding at March 31, 2023 |
|  |  |  |  | Weighted Average |  |  | Weighted Average |
|  |  |  |  | Exercise Price |  |  | Remaining Contractual |
Range of Exercise Prices per Share |  | Shares |  |  | Per Share |  |  | Term (Years) |
$121.43 - $200.00 |  |  | 873 |  |  | $ | 137.87 |  |  |  | 3.9 |
$200.01 - $300.00 |  |  | 80 |  |  | $ | 239.61 |  |  |  | 9.4 |
$400.01 - $500.00 |  |  | 317 |  |  | $ | 408.73 |  |  |  | 8.8 |
$600.01 - $691.23 |  |  | 250 |  |  | $ | 691.23 |  |  |  | 7.8 |
Total |  |  | 1,520 |  |  | $ | 290.79 |  |  |  | 5.9 |
Assumptions Used in Black-Scholes Pricing Model | The weighted average grant date fair value of stock option awards using the Black-Scholes valuation model was $227.51 for each share subject to a stock option granted during the three months ended March 31, 2022 based on the following assumptions:
|  | Three months ended
|  | March 31,
|  | 2022
Expected term of options in years |  | 6.3
Expected volatility |  | 58.4%
Risk-free interest rate |  | 1.9%
Expected dividend yield |  | 0.0%
Summary of Share-Settled Restricted Stock Unit Activity | As of March 31, 2023, there were 115,609 share-settled restricted stock units outstanding under the 2013 Equity Plan. The following table summarizes the Company’s share-settled restricted stock unit activity (in thousands) for the periods indicated:
|  | Share-Settled Restricted Stock Units Outstanding |
|  |  |  |  | Aggregate |
|  | Units |  |  | Intrinsic Value |
Balance as of January 1, 2023 |  |  | 120 |  |  |  |
Granted |  |  | 6 |  |  |  |
Vested |  |  | (6 | ) |  | $ | 1,598 |
Forfeited |  |  | (4 | ) |  |  |
Balance as of March 31, 2023 |  |  | 116 |  |  |  |
Expected to vest as of March 31, 2023 |  |  | 116 |  |  | $ | 33,795 |
Summary of Components of Tax (benefit) Expense Related To Equity Plan | The following table summarizes the tax (benefit) expense related to the Company’s equity plans (in thousands) for the three months ended March 31, 2023 and 2022:
|  | Three Months Ended |
|  | March 31, |
|  | 2023 |  |  | 2022 |
Tax (benefit) expense related to: |  |  |  |  |  |
Share-based compensation expense |  | $ | (3,225 | ) |  | $ | (2,897 | )
Exercises of stock options and vesting of share-settled restricted stock units |  |  | (85 | ) |  |  | 53 |
Total tax benefit related to the Company's equity plans |  | $ | (3,310 | ) |  | $ | (2,844 | )

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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