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Stock Based Compensation (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuance	1,466,084
Share based compensation	$ 7,716	$ 9,310	$ 10,316
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	$ 6,800	7,300	7,800
Compensation expense related to unvested restricted stock unit based awards	$ 10,400
Weighted average period, Restricted stock units	2 years 4 months 24 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	$ 1,000	2,000	$ 2,500
Compensation expense related to common stock subject to vesting requirements	$ 1,600
Weighted average period, Common stock	1 year 8 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	$ 1,000	$ 100

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