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Stock Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Stock Plans |
Share-Based Compensation Activity | A summary of the status of the Company’s restricted stock units as of December 31, 2018 and changes during the year ended December 31, 2018, is presented below:
|  |  |  | Weighted
|  |  |  | Average
|  |  |  | Grant-Date
Restricted Stock Units |  | Shares |  | Fair Value
Nonvested shares at January 1, 2018 |  | 413,764 |  | $ | 54.57
Granted |  | 160,025 |  |  | 71.74
Vested |  | (189,865) |  |  | 54.35
Canceled |  | (20,802) |  |  | 58.44
Nonvested shares at December 31, 2018 |  | 363,122 |  |  | 60.24

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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=109197908&loc=d3e5070-113901 + Details
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