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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-Based Compensation [Abstract] |
Non-vested Stock and Performance Unit Activity | The following table summarizes the non-vested stock and performance stock unit activity:
(In thousands except fair value) |  | Shares |  |  | Grant Date Weighted Average Fair Value |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2017 |  |  | 412 |  |  | $ | 65.64 |  |  | $ | 30,113 |
Granted |  |  | 142 |  |  |  | 59.45 |  |  |  |  |
Vested |  |  | (111 | ) |  |  | 56.91 |  |  |  |  |
Cancelled |  |  | (63 | ) |  |  | 64.71 |  |  |  |  |
Outstanding at December 31, 2018 |  |  | 380 |  |  |  | 66.02 |  |  |  | 21,239 |
Granted |  |  | 134 |  |  |  | 60.04 |  |  |  |  |
Vested |  |  | (46 | ) |  |  | 63.61 |  |  |  |  |
Cancelled |  |  | (64 | ) |  |  | 62.39 |  |  |  |  |
Outstanding at December 31, 2019 |  |  | 404 |  |  |  | 64.89 |  |  |  | 26,710 |
Granted |  |  | 142 |  |  |  | 65.61 |  |  |  |  |
Vested |  |  | (27 | ) |  |  | 74.21 |  |  |  |  |
Cancelled |  |  | (68 | ) |  |  | 73.39 |  |  |  |  |
Outstanding at December 31, 2020 |  |  | 451 |  |  | $ | 63.28 |  |  | $ | 33,283 |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- References No definition available. + Details
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