Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance, at Dec. 31, 2011	$ 9,949	$ 881,346	$ 5,448	$ (150,857)	$ 745,886
Balance, shares at Dec. 31, 2011	33,047,807			6,149,364
Net income	0	82,511	0	0	82,511
Other comprehensive (loss) income, net of reclassification adjustments and tax	0	0	(429)	0	(429)
Dividends paid	0	(32,278)	0	0	(32,278)
Balance, at Dec. 29, 2012	9,949	931,579	5,019	(150,857)	795,690
Balance, shares at Dec. 29, 2012	33,047,807			6,149,364
Net income	0	71,721	0	0	71,721
Other comprehensive (loss) income, net of reclassification adjustments and tax	0	0	(1,080)	0	(1,080)
Dividends paid	0	(32,278)	0	0	(32,278)
Balance, at Dec. 28, 2013	9,949	971,022	3,939	(150,857)	834,053
Balance, shares at Dec. 28, 2013	33,047,807			6,149,364
Net income	0	55,167	0	0	55,167
Other comprehensive (loss) income, net of reclassification adjustments and tax	0	0	890	0	890
Dividends paid	0	(32,278)	0	0	(32,278)
Balance, at Dec. 27, 2014	$ 9,949	$ 993,911	$ 4,829	$ (150,857)	$ 857,832
Balance, shares at Dec. 27, 2014	33,047,807			6,149,364