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Stock Based Compensation (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for future issuance |  | 1,798,440 |  |
Performance based stock option grant | 2,916,563 |  |  |
Share based compensation |  | $ 9,310 | $ 10,316 | $ 8,765
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% |  |
Share based compensation |  | $ 7,300 | 7,800 | 7,600
Compensation expense related to unvested restricted stock unit based awards |  | $ 8,900 |  |
Weighted average period, Restricted stock units |  | 2 years 6 months |  |
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 |  | $ 2,000 | 2,500 | $ 1,200
Compensation expense related to common stock subject to vesting requirements |  | $ 2,200 |  |
Weighted average period, Common stock |  | 2 years 2 months 12 days |  |
Common Stock Subject to Vesting Requirements [Member] | Jibe Consulting Inc and Technolab International Corporation [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options vesting period |  | 4 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid |  | $ 100 | $ 3,600 |

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