Employee Benefit Plan (Narrative)(Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 25, 2016 |
Dec. 27, 2015 |
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| Retirement Benefits [Abstract] | |||
| Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 292,000 | $ 229,000 | $ 209,000 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. No definition available.
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