Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Change in uncertain tax benefit reserves
Balance at beginning of year	$ 2,161	$ 2,532	$ 2,175
Reductions due to lapses in statutes of limitations	(44)	(65)	(8)
Reductions due to payments for tax positions settled	(379)	(702)
Reductions due to reversals of prior year positions	(651)	(210)
Additions based on tax positions taken during the current period	698	606	365
Balance at end of year	$ 1,785	$ 2,161	$ 2,532