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Share-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 24, 2020 | Jun. 26, 2019 | Jun. 24, 2020 | Jun. 26, 2019
Total share-based compensation [Abstract] |  |  |  |
Total share-based compensation | $ 1,511 | $ 2,713 | $ (26) | $ 4,966
Certain Employee |  |  |  |
Total share-based compensation [Abstract] |  |  |  |
Total share-based compensation | 1,326 | 2,463 | (420) | 4,461
Restricted Stock Units [Abstract] |  |  |  |
Unrecognized compensation cost related to unvested share awards outstanding | $ 12,300 |  | $ 12,300 |
Unrecognized compensation cost, expected weighted average period |  |  | 1 year 8 months 12 days |
Board Members |  |  |  |
Restricted Stock Units [Abstract] |  |  |  |
Restricted stock units converted into shares of common stock (less than, in shares) | 0.1 |  | 0.1 |
Performance share awards | Certain Employee |  |  |  |
Restricted Stock Units [Abstract] |  |  |  |
Common stock, shares issued (in shares) |  |  | 0.3 |
Shares paid for tax withholding (in shares) |  |  | 0.1 |
Restricted stock units for board members | Certain Employee |  |  |  |
Restricted Stock Units [Abstract] |  |  |  |
Grants in periods (less than, in shares) | 0.8 |  | 0.8 |
Fair value of units granted (in dollars per share) | $ 10.46 |  | $ 10.46 |
Award vesting period |  |  | 2 years |
Restricted stock units for board members | Board Members |  |  |  |
Total share-based compensation [Abstract] |  |  |  |
Total share-based compensation | $ 185 | $ 250 | $ 394 | $ 505
Restricted Stock Units [Abstract] |  |  |  |
Grants in periods (less than, in shares) | 0.1 |  | 0.1 |
Fair value of units granted (in dollars per share) | $ 10.46 |  | $ 10.46 |
Unrecognized compensation cost related to unvested share awards outstanding | $ 800 |  | $ 800 |
Unrecognized compensation cost, expected weighted average period |  |  | 10 months 24 days |
Award vesting period |  |  | 1 year |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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