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SHARE-BASED AWARDS (Tables) | 12 Months Ended
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Dec. 31, 2018
SHARE-BASED AWARDS |
Summary of Compensation expense and Other Measures Related to Share-Based awards |
|  | Years Ended December 31, |
Share-based compensation expense, net of estimated forfeitures (in millions) |  | 2018 |  | 2017 |  | 2016 |
Share-based compensation expense |  | $ | 12.1 |  | $ | 11.1 |  | $ | 9.8 |
Intrinsic value of options exercised |  | $ | 0.5 |  | $ | 0.7 |  | $ | 2.0 |
Tax benefit realized upon stock vesting |  | $ | 2.7 |  | $ | 6.8 |  | $ | 5.9 |
Fair value of stock vested |  | $ | 10.8 |  | $ | 17.3 |  | $ | 15.8 |
Stock Option Activity | Activity in the Company’s stock option plans for the year ended December 31, 2018, was as follows (in thousands, except weighted average exercise price and weighted average contractual life):
|  |  |  | Weighted |  | Weighted |  |  |  |
|  |  |  | Average |  | Average |  | Aggregate |
|  | 2007 Plan |  | Exercise |  | Contractual |  | Intrinsic |
|  | Shares |  | Price |  | Life |  | Value |
Outstanding at December 31, 2017 |  | 235 |  | $ | 21.54 |  |  |  |  |  |
Exercised |  | (39) |  | $ | 20.18 |  |  |  |  |  |
Outstanding at December 31, 2018 |  | 196 |  | $ | 21.81 |  | 2.6 |  | $ | 1,998 |
Exercisable at December 31, 2018 |  | 196 |  | $ | 21.81 |  | 2.6 |  | $ | 1,998 |
Non-Vested Restricted Stock Unit Activity | The following table summarizes non-vested restricted stock unit activity through December 31, 2018, (in thousands, except weighted average grant-date fair value amounts):
|  | 2007 Plan |  | 2016 Plan |  | Total |  | Weighted |
|  | Restricted |  | Restricted |  | Restricted |  | Average Grant- |
|  | Stock Units |  | Stock Units |  | Stock Units |  | Date Fair Value |
Outstanding at December 31, 2017 |  | 377 |  | 309 |  | 686 |  | $ | 36.41 |
Granted |  | — |  | 384 |  | 384 |  | $ | 31.15 |
Settlement of Performance Shares (1) |  | 60 |  | — |  | 60 |  | $ | 36.97 |
Vested |  | (268) |  | (78) |  | (346) |  | $ | 36.24 |
Canceled |  | (5) |  | (20) |  | (25) |  | $ | 34.49 |
Outstanding at December 31, 2018 |  | 164 |  | 595 |  | 759 |  | $ | 33.92 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option 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 (d) -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 (e) -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 (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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