Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 27, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 28, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Net Income	$ 8,130	$ 4,946	$ 6,534	$ 4,334	$ 1,361	$ (2,419)	$ 5,039	$ 4,822	$ 23,944	$ 8,803	$ 22,824
Weighted average shares outstanding, basic									26,599,000	26,908,000	27,392,000
Earnings Per Share, Basic	$ 0.31	$ 0.19	$ 0.24	$ 0.16	$ 0.05	$ (0.09)	$ 0.19	$ 0.18	$ 0.90	$ 0.33	$ 0.83
Weighted average dilutive stock options									34,000	112,000	139,000
Weighted average shares outstanding, diluted									26,633,000	27,020,000	27,531,000
Diluted income per share	$ 0.31	$ 0.19	$ 0.24	$ 0.16	$ 0.05	$ (0.09)	$ 0.18	$ 0.18	$ 0.90	$ 0.33	$ 0.83
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									147,150	985,677	1,291,427
Antidilutive Securities Excluded from Computation of Earnings Per Share, Price Range, Lower Range Limit									$ 21.84	$ 22.57	$ 19.19
Antidilutive Securities Excluded from Computation of Earnings Per Share, Price Range, Upper Range Limit									$ 22.57	$ 43.22	$ 43.22