Share-Based Compensation (Stock Options) (Details) - Stock Options [Member] $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 27, 2017 USD ($) $ / shares shares
Options [Roll Forward]:
Outstanding, beginning of year | shares	1,127
Exercised | shares	(227)
Outstanding, end of year | shares	900
Exercisable, end of year | shares	900
Weighted-Average Exercise Price [Roll Forward]:
Outstanding, beginning of year | $ / shares	$ 3.01
Exercised | $ / shares	2.88
Outstanding, end of year | $ / shares	3.04
Exercisable, end of year | $ / shares	$ 3.04
Weighted-Average Remaining Contractual Life and Aggregate Intrinsic Value:
Outstanding, end of year, weighted-average remaining contractual life	2 years 3 months 20 days
Exercisable, end of year, weighted-average remaining contractual life	2 years 3 months 20 days
Outstanding, end of year, aggregate intrinsic value | $	$ 9,320
Exercisable, end of year, aggregate intrinsic value | $	$ 9,320