Stock-Based Employee Compensation (Summary Of Non-Vested Stock Options) (Details)	3 Months Ended
	Mar. 21, 2017 $ / shares shares
Stock-Based Employee Compensation [Abstract]
Non-vested stock options at beginning of period, Shares | shares	151,625
Non-vested stock options, Vested, Shares | shares	(3,000)
Non-vested stock options, Forfeited, Shares | shares	(17,250)
Non-vested stock options at end of period, Shares | shares	131,375
Non-vested stock options at beginning of period, Weighted average grant date fair value | $ / shares	$ 8.44
Non-vested stock options, Vested, Weighted average grant date fair value | $ / shares	9.99
Non-vested stock options, Forfeited, Weighted average grant date fair value | $ / shares	8.50
Non-vested stock options at end of period, Weighted average grant date fair value | $ / shares	$ 8.40