Property and Equipment (Narrative)(Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 25, 2016 |
Dec. 27, 2015 |
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| Property, Plant and Equipment [Abstract] | |||
| Depreciation | $ 17.4 | $ 15.0 | $ 12.7 |
| X | ||||||||||
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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