Condensed Consolidated Statement of Shareholders' Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Treasury Stock [Member]	Paid-in Capital [Member]	(Deficit) [Member]	Accumulated Other Comprehensive Loss, Net [Member]
Balance at Dec. 25, 2013	$ 8,431	$ 1,050	$ (72,336)	$ 567,505	$ (470,946)	$ (16,842)
Balance, treasury stock, at cost, shares at Dec. 25, 2013	(15,782)		(15,782)
Balance, common stock, shares issued at Dec. 25, 2013	105,014	105,014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,047				23,047
Other comprehensive loss	(296)					(296)
Share-based compensation on equity classified awards	1,608			1,608
Purchase of treasury stock	(31,960)		(31,960)
Purchase of treasury stock (in shares)	(4,871)		(4,871)
Issuance of common stock for share-based compensation	0	2		(2)
Issuance of common stock for share-based compensation (in shares)		151
Exercise of common stock options	970	3		967
Exercise of common stock options (in shares)		333
Tax benefit from share-based compensation	627			627
Balance at Sep. 24, 2014	$ 2,427	$ 1,055	$ (104,296)	$ 570,705	$ (447,899)	$ (17,138)
Balance, treasury stock, at cost, shares at Sep. 24, 2014	(20,653)		(20,653)
Balance, common stock, shares issued at Sep. 24, 2014	105,498	105,498