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Share-Based Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Shares Granted and Weighted Average Fair Value Per Share | The number of shares underlying grants to employees and members of our Board of Directors, and the weighted-average fair value per share for shares granted during the first quarter of 2019 and 2018 are presented in the table below:
| 3 Months Ended March 31,
| 2019 |  | 2018
| Shares Granted |  | Wtd.-Avg. Per Share |  | Shares Granted |  | Wtd.-Avg. Per Share
| (thousands) |  | Fair Value |  | (thousands) |  | Fair Value
Stock Options | 163 |  |  | $ | 17.78 |  |  | 122 |  |  | $ | 31.46 |
Deferred Stock Units | 20 |  |  | 64.80 |  |  | 10 |  |  | 126.11 |
Restricted Stock Units | 203 |  |  | 78.90 |  |  | 137 |  |  | 117.60 |
Performance Share Units | 136 |  |  | 77.70 |  |  | 94 |  |  | 117.19 |
Total Shares Granted | 522 |  |  | $ | 58.96 |  |  | 363 |  |  | $ | 88.76 |

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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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