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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Stock Based Compensation Expense | Stock-based compensation expense is summarized as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
(in thousands) |  |  |  |  |  |  |
Stock-based compensation expense | $ | 5,989 |  |  | $ | 6,299 |  |  | $ | 21,833 |  |  | $ | 16,412 |
Summary of Restricted Stock Units Activity | RSU activity, inclusive of PSUs, for the nine months ended September 30, 2021 is summarized as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2020 | 533,185 |  |  | $ | 106.19 |
Granted | 107,216 |  |  | $ | 268.56 |
Forfeited | (22,752) |  |  | $ | 127.96 |
Settled | (184,589) |  |  | $ | 123.17 |
Outstanding at September 30, 2021 | 433,060 |  |  | $ | 138.00 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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