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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-Based Compensation [Abstract] |
Summary of Nonvested 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, 2014 |  |  | 604 |  |  | $ | 43.84 |  |  | $ | 36,454 |
Granted |  |  | 154 |  |  |  | 60.65 |  |  |  |  |
Vested |  |  | (74 | ) |  |  | 35.51 |  |  |  |  |
Cancelled |  |  | (142 | ) |  |  | 47.02 |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 542 |  |  |  | 48.94 |  |  |  | 34,063 |
Granted |  |  | 119 |  |  |  | 69.92 |  |  |  |  |
Vested |  |  | (172 | ) |  |  | 43.42 |  |  |  |  |
Cancelled |  |  | (54 | ) |  |  | 52.41 |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 435 |  |  |  | 56.44 |  |  |  | 34,184 |
Granted |  |  | 115 |  |  |  | 74.26 |  |  |  |  |
Vested |  |  | (114 | ) |  |  | 39.75 |  |  |  |  |
Cancelled |  |  | (24 | ) |  |  | 63.62 |  |  |  |  |
Outstanding at December 31, 2017 |  |  | 412 |  |  | $ | 65.64 |  |  | $ | 30,113 |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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 + Details
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- References No definition available. + Details
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