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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Option Activity | The following table summarizes stock option activity for fiscal years 2016, 2015 and 2014:
|  | Number of Common Shares |  |  | Weighted- |
|  | Options |  |  |  |  |  |  | Average |
|  | Outstanding |  |  | Exercisable |  |  | Exercise Price |
Balance at December 31, 2015 |  |  | 2,419,529 |  |  |  | 724,529 |  |  | $ | 8.16 |
Granted |  |  | 1,494,475 |  |  |  |  |  |  |  | 12.03 |
Options Subject to Anti-Dilutive Adjustments |  |  | (2,337,643 | ) |  |  |  |  |  |  | 8.75 |
Options Subject to Anti-Dilutive Adjustments |  |  | 2,337,643 |  |  |  |  |  |  |  | 7.04 |
Exercised |  |  | (313,500 | ) |  |  |  |  |  |  | 5.72 |
Cancelled |  |  | (198,023 | ) |  |  |  |  |  |  | 8.10 |
Balance at December 31, 2016 |  |  | 3,402,481 |  |  |  | 411,029 |  |  | $ | 9.02 |
Balance at December 28, 2014 |  |  | 755,617 |  |  |  | 616,792 |  |  | $ | 6.09 |
Granted |  |  | 1,695,000 |  |  |  |  |  |  |  | 9.07 |
Exercised |  |  | (25,088 | ) |  |  |  |  |  |  | 9.62 |
Cancelled |  |  | (6,000 | ) |  |  |  |  |  |  | 9.19 |
Balance at December 31, 2015 |  |  | 2,419,529 |  |  |  | 724,529 |  |  | $ | 8.16 |
Balance at December 29, 2013 |  |  | 798,171 |  |  |  | 585,769 |  |  | $ | 5.97 |
Forfeited/cancelled/expired |  |  | (25,211 | ) |  |  |  |  |  |  | 5.19 |
Exercised |  |  | (28,343 | ) |  |  |  |  |  |  | 4.73 |
Granted |  |  | 11,000 |  |  |  |  |  |  |  | 9.18 |
Balance at December 28, 2014 |  |  | 755,617 |  |  |  | 616,792 |  |  | $ | 6.09 |
Schedule of Assumptions Used to Estimate the Fair Value of Stock Options Granted | The following assumptions were used to estimate the fair value of stock options granted during fiscal years 2016, 2015 and 2014:
| 2016 |  |  | 2015 |  |  | 2014 |
Expected dividend yield |  | — |  |  |  | — |  |  |  | — |
Risk-free interest rate | 1.43 – 2.40% |  |  | 2.18 – 2.36% |  |  | 2.39 – 2.88% |
Expected term (in years) |  | 10 |  |  |  | 10 |  |  |  | 10 |
Expected volatility | 24.03 – 26.95% |  |  | 27.24 – 27.60% |  |  | 32.87 – 39.35% |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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