Stock-Based Employee Compensation (Summary Of Non-Vested Stock Options) (Details)	6 Months Ended
	Jun. 13, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Non-vested stock options at beginning of period, Shares | shares	151,625
Non-vested stock options, Vested, Shares | shares	(10,500)
Non-vested stock options, Forfeited, Shares | shares	(36,250)
Non-vested stock options at end of period, Shares | shares	104,875
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
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	7.85
Non-vested stock options, Forfeited, Weighted average grant date fair value | $ / shares	8.51
Non-vested stock options at end of period, Weighted average grant date fair value | $ / shares	$ 8.48