Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Earnings per share
Net Earnings	$ 3,301	$ 4,132	$ 5,584	$ 9,248
Basic EPS, Shares	34,022	34,375	34,064	34,334
Diluted EPS, Shares	34,574	35,025	34,647	35,050
Equity-based compensation plans, Shares	552	650	583	716
Basic EPS, Per Shares Amount	$ 0.10	$ 0.12	$ 0.16	$ 0.27
Diluted EPS, Per Shares Amount	$ 0.10	$ 0.12	$ 0.16	$ 0.26