Income Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 24, 2012	Jun. 30, 2013	Jun. 24, 2012
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,800,000	2,600,000	1,600,000	2,000,000
Net income	$ 6,324	$ 6,414	$ 11,258	$ 13,147
Basic income per share	$ 0.23	$ 0.24	$ 0.41	$ 0.48
Weighted average shares outstanding, basic	27,348,000	27,209,000	27,328,000	27,190,000
Diluted income per share	$ 0.23	$ 0.23	$ 0.41	$ 0.48
Weighted average dilutive stock options	104,000	98,000	176,000	123,000
Weighted average shares outstanding, diluted	27,452,000	27,307,000	27,504,000	27,313,000