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Equity Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity Compensation |
Schedule of Information Pertaining to Option Activity | Information pertaining to option activity during 2017 is as follows (number of options and aggregate intrinsic value in thousands):
|  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  |  |  |  | Average |  |  |  |
|  |  |  | Weighted |  | Remaining |  |  |  |
|  | Number |  | Average |  | Contractual |  | Aggregate |
|  | of |  | Exercise |  | Term |  | Intrinsic |
|  | Options |  | Price |  | (In Years) |  | Value |
Outstanding at December 25, 2016 |  | 1,316 |  | $ | 46.58 |  |  |  |  |  |
Granted |  | 315 |  |  | 78.59 |  |  |  |  |  |
Exercised |  | (147) |  |  | 42.71 |  |  |  |  |  |
Cancelled |  | (32) |  |  | 68.30 |  |  |  |  |  |
Outstanding at December 31, 2017 |  | 1,452 |  | $ | 53.43 |  | 7.07 |  | $ | 13,901 |
Exercisable at December 31, 2017 |  | 800 |  | $ | 40.72 |  | 5.89 |  | $ | 13,901 |
Summary of the Significant Assumptions Used in Estimating the Fair Value of Options Granted | The following is a summary of the significant assumptions used in estimating the fair value of options granted in 2017, 2016 and 2015:
|  | 2017 |  | 2016 |  | 2015 |
Assumptions (weighted average): |  |  |  |  |  |  |
Risk-free interest rate |  | 2.0 | % | 1.3 | % | 1.6 | %
Expected dividend yield |  | 1.0 | % | 1.2 | % | 0.9 | %
Expected volatility |  | 26.7 | % | 27.4 | % | 28.5 | %
Expected term (in years) |  | 5.6 |  | 5.5 |  | 5.5 |
Schedule of Information Pertaining to Restricted Stock Activity | The fair value of both time-based restricted stock and performance-based restricted stock units is based on the market price of the Company’s shares on the grant date. Information pertaining to these awards during 2017 is as follows (shares in thousands):
|  |  |  | Weighted |
|  |  |  | Average |
|  |  |  | Grant-Date |
|  | Shares |  | Fair Value |
Total as of December 25, 2016 |  | 185 |  |  | 59.21 |
Granted |  | 86 |  |  | 78.52 |
Incremental Performance Shares* |  | 3 |  |  | 50.59 |
Forfeited |  | (7) |  |  | 69.14 |
Vested |  | (86) |  |  | 56.45 |
Total as of December 31, 2017 |  | 181 |  | $ | 69.11 |
* Additional shares from the 2014 performance-based restricted stock unit grant due to exceeding the initial 100% target resulting in a 122% payout.

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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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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