Earnings Per Share Computation of EPS, Basic and Diluted (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net income	$ 7,439	$ 7,794	$ 47,935	$ 44,177
Basic weighted average common shares outstanding	16,958	17,397	17,128	17,595
Potential common shares for restricted stock	163	76	110	57
Diluted weighted average common shares outstanding	17,121	17,473	17,238	17,652
Earnings per share:
Basic (in dollars per share)	$ 0.44	$ 0.45	$ 2.80	$ 2.51
Diluted (in dollars per share)	$ 0.43	$ 0.45	$ 2.78	$ 2.50