Consolidated Statements of Changes in Shareholders Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock at Cost	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2011	$ 300,577	$ 666	$ 165,712	$ 947,156	$ (813,684)	$ 727
Beginning Balance (in shares) at Dec. 31, 2011		66,602,486			19,882,289
Net income	129,781			129,781
Dividends	(33,981)			(33,981)
Purchases of common stock (in shares)					524,674
Purchases of common stock	(25,826)				(25,826)
Issuance of stock related to stock-based compensation plans, including excess tax effect (in shares)		257,378			4,773
Issuance of stock related to stock-based compensation plans, including excess tax effect	2,111	3	2,115		(7)
Stock-based compensation	6,149		6,149
Other comprehensive (loss) income	643					643
Ending Balance at Dec. 29, 2012	379,454	669	173,976	1,042,956	(839,517)	1,370
Ending Balance (in shares) at Dec. 29, 2012		66,859,864			20,411,736
Net income	146,009			146,009
Dividends	(15,921)			(15,921)
Purchases of common stock (in shares)					1,116,673
Purchases of common stock	(59,496)				(59,496)
Issuance of stock related to stock-based compensation plans, including excess tax effect (in shares)		157,994			284
Issuance of stock related to stock-based compensation plans, including excess tax effect	906	1	920		(15)
Stock-based compensation	4,911		4,911
Other comprehensive (loss) income	(1,382)					(1,382)
Ending Balance at Dec. 28, 2013	454,481	670	179,807	1,173,044	(899,028)	(12)
Ending Balance (in shares) at Dec. 28, 2013		67,017,858			21,528,693
Net income	138,809			138,809
Dividends	(56,479)			(56,479)
Purchases of common stock (in shares)					939,872
Purchases of common stock	(56,393)				(56,393)
Issuance of stock related to stock-based compensation plans, including excess tax effect (in shares)		250,959			5,766
Issuance of stock related to stock-based compensation plans, including excess tax effect	2,219	3	2,408		(192)
Stock-based compensation	6,797		6,797
Other comprehensive (loss) income	(1,173)					(1,173)
Ending Balance at Dec. 27, 2014	$ 488,261	$ 673	$ 189,012	$ 1,255,374	$ (955,613)	$ (1,185)
Ending Balance (in shares) at Dec. 27, 2014		67,268,817			22,474,331