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Share-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Costs Associated with Share-Based Compensation Plans | Costs associated with the Company’s share-based compensation plans are summarized as follows:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(in thousands) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RSUs |  | $ | 6,084 |  |  | $ | 7,049 |  |  | $ | 41,908 |  |  | $ | 39,763 |
Employee stock purchase plan |  |  | 1,181 |  |  |  | 1,355 |  |  |  | 4,725 |  |  |  | 4,237 |
|  | $ | 7,265 |  |  | $ | 8,404 |  |  | $ | 46,633 |  |  | $ | 44,000 |
Summary of RSU Activity | RSU activity for the nine months ended September 30, 2021 is summarized as follows:
(in thousands, except weighted-average grant-date fair value) |  | Shares |  |  | Weighted-average grant-date fair value |
Unvested at December 31, 2020 |  | 905 |  |  | $ | 57.24 |
Granted during 2021 |  | 866 |  |  | $ | 56.41 |
Vested during 2021 |  | (840 | ) |  | $ | 55.81 |
Forfeited during 2021 |  | (24 | ) |  | $ | 56.75 |
Unvested at September 30, 2021 |  | 907 |  |  | $ | 57.78 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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