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Stock Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 25, 2020 USD ($) $ / shares shares
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	635,655
Weighted average grant-date fair value | $ / shares	$ 15.47
Shares outstanding | shares	1,213,312
Nonvested weighted average grant-date fair value | $ / shares	$ 16.53
Compensation expense | $	$ 13.4
Weighted average period	2 years 3 months 18 days
Common Stock Subject to Vesting Requirements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding | shares	81,407
Nonvested weighted average grant-date fair value | $ / shares	$ 18.13
Compensation expense | $	$ 0.8
Weighted average period	1 year

X

- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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