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Stock Based Compensation (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jan. 01, 2021 | Dec. 27, 2019 | Dec. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for future issuance | 2,052,508 |  |
Share based compensation | $ 9,740 | $ 7,716 | $ 9,310
Stock Appreciation Rights (SARs) And Stock Options [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options vesting period | 4 years |  |
Stock Appreciation Rights (SARs) And Stock Options [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options vesting period | 10 years |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock units, vesting schedules options one | 4 years |  |
Percentage of vesting on restricted stock, option one, Second anniversary | 50.00% |  |
Percentage of vesting on restricted stock, option one, Third anniversary | 25.00% |  |
Percentage of vesting on restricted stock, option one, Fourth anniversary | 25.00% |  |
Restricted stock units, vesting schedules options two | 4 years |  |
Percentage of vesting on restricted stock, option two, First anniversary | 25.00% |  |
Percentage of vesting on restricted stock, option two, Second anniversary | 25.00% |  |
Percentage of vesting on restricted stock, option two, Third anniversary | 25.00% |  |
Percentage of vesting on restricted stock, option two, Fourth anniversary | 25.00% |  |
Restricted stock units, vesting schedules options three | 3 years |  |
Percentage of vesting on restricted stock, option three, First anniversary | 33.00% |  |
Percentage of vesting on restricted stock, option three, Second anniversary | 33.00% |  |
Percentage of vesting on restricted stock, option three, Third anniversary | 33.00% |  |
Restricted stock units, vesting schedules options four | 1 year |  |
Percentage of vesting on restricted stock, option four, First anniversary | 100.00% |  |
Share based compensation | $ 8,700 | 6,800 | 7,100
Compensation expense related to unvested restricted stock unit based awards | $ 11,100 |  |
Weighted average period, Restricted stock units | 2 years 3 months 18 days |  |
Common Stock Subject to Vesting Requirements [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options vesting period | 4 years |  |
Share based compensation | $ 1,100 | 1,000 | $ 2,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid |  | $ 1,000 |
Compensation expense related to common stock subject to vesting requirements | $ 500 |  |
Weighted average period, Common stock | 10 months 24 days |  |
Common Stock Subject to Vesting Requirements [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options vesting period |  | 4 years |

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