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Stock-based Compensation - Restricted and Deferred Stock Units (Details) - USD ($) |  | 3 Months Ended
--- | --- | ---
Mar. 24, 2021 | Mar. 31, 2021 | Mar. 31, 2020
Additional disclosures |  |  |
Compensation expense recognized |  | $ 1,400,000 | $ 1,100,000
Restricted stock unit |  |  |
Shares |  |  |
Non-vested at beginning of year (in shares) |  | 1,017,038 |
Granted (in shares) |  | 212,426 |
Dividend equivalents earned (in shares) |  | 11,310 |
Forfeited (in shares) |  | (13,422) |
Non-vested at end of year (in shares) |  | 1,227,352 |
Outstanding at end of year (in shares) |  | 1,227,352 |
Weighted-Average Grant Date Fair Value |  |  |
Non-vested at beginning of year (in dollars per share) |  | $ 23.87 |
Granted (in dollars per share) |  | 24.54 |
Dividend equivalents earned (in dollars per share) |  | 20.67 |
Forfeited (in dollars per share) |  | 26.98 |
Non-vested at end of year (in dollars per share) |  | 23.93 |
Outstanding at end of year (in dollars per share) |  | $ 23.93 |
Deferred stock units |  |  |
Shares |  |  |
Non-vested at beginning of year (in shares) |  | 34,263 |
Granted (in shares) |  | 33,288 |
Dividend equivalents earned (in shares) |  | 1,172 |
Vested (in shares) |  | (791) |
Non-vested at end of year (in shares) |  | 67,932 |
Outstanding at end of year (in shares) |  | 71,835 |
Weighted-Average Grant Date Fair Value |  |  |
Non-vested at beginning of year (in dollars per share) |  | $ 17.18 |
Granted (in dollars per share) |  | 24.54 |
Dividend equivalents earned (in dollars per share) |  | 20.67 |
Vested (in dollars per share) |  | 20.67 |
Non-vested at end of year (in dollars per share) |  | 20.81 |
Outstanding at end of year (in dollars per share) |  | $ 24.30 |
Performance Stock units (PSUs) |  |  |
Shares |  |  |
Granted (in shares) |  | 28,344 |
Additional disclosures |  |  |
Compensation expense recognized |  | $ 700,000 |
Performance Stock units (PSUs) | Minimum |  |  |
Additional disclosures |  |  |
Vesting percentage (as a percent) |  | 0.00% |
Performance Stock units (PSUs) | Maximum |  |  |
Shares |  |  |
Granted (in shares) |  | 39,682 |
Additional disclosures |  |  |
Vesting percentage (as a percent) |  | 140.00% |
Market Based Performance Stock Units |  |  |
Shares |  |  |
Granted (in shares) |  | 70,815 |
Additional disclosures |  |  |
Compensation expense recognized |  | $ 1,700,000 |
Market Based Performance Stock Units | Minimum |  |  |
Additional disclosures |  |  |
Vesting percentage (as a percent) |  | 0.00% |
Market Based Performance Stock Units | Maximum |  |  |
Shares |  |  |
Granted (in shares) |  | 113,304 |
Additional disclosures |  |  |
Vesting percentage (as a percent) |  | 160.00% |
RSUs and DSUs |  |  |
Additional disclosures |  |  |
Amount of compensation cost to be recognized |  | $ 17,500,000 |
Period over which cost will be recognized |  | 3 years 2 months 12 days |
Stock option awards |  |  |
Additional disclosures |  |  |
Compensation expense recognized |  | $ 0 | $ 0
2020 Equity Incentive Plan |  |  |
Additional disclosures |  |  |
Remaining shares available for issuance |  | 1,094,149 |
2020 Equity Incentive Plan | Restricted stock unit | Management, Vice Chairman of Board |  |  |
Shares |  |  |
Granted (in shares) | 212,426 |  |
Additional disclosures |  |  |
Compensation expense recognized | $ 5,200,000 |  |
Vesting percentage (as a percent) | 100.00% |  |
2020 Equity Incentive Plan | Restricted stock unit | Management, Vice Chairman of Board | Minimum |  |  |
Additional disclosures |  |  |
Period over which cost will be recognized | 1 year |  |
2020 Equity Incentive Plan | Restricted stock unit | Management, Vice Chairman of Board | Maximum |  |  |
Additional disclosures |  |  |
Period over which cost will be recognized | 5 years |  |
2020 Equity Incentive Plan | Deferred stock units | Directors and Advisory Directors |  |  |
Shares |  |  |
Granted (in shares) | 33,288 |  |
Additional disclosures |  |  |
Compensation expense recognized | $ 800,000 |  |
Period over which cost will be recognized | 1 year |  |
Vesting percentage (as a percent) | 100.00% |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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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