Income Per Share (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 25, 2016	Sep. 25, 2016	Jun. 26, 2016	Mar. 27, 2016	Dec. 27, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 31, 2016	Dec. 25, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Net Income	$ 7,778,000	$ 5,974,000	$ 13,165,000	$ 14,464,000	$ 8,130,000	$ 4,946,000	$ 6,534,000	$ 4,334,000	$ 41,381,000	$ 41,381,000	$ 23,944,000	$ 8,803,000
Weighted average shares outstanding, basic									25,439,000		26,599,000	26,908,000
Earnings Per Share, Basic	$ 0.31	$ 0.24	$ 0.52	$ 0.56	$ 0.31	$ 0.19	$ 0.24	$ 0.16	$ 1.63	$ 1.63	$ 0.90	$ 0.33
Weighted average dilutive stock options									100,000		34,000	112,000
Weighted average shares outstanding, diluted									25,539,000		26,633,000	27,020,000
Diluted income per share	$ 0.31	$ 0.23	$ 0.52	$ 0.56	$ 0.31	$ 0.19	$ 0.24	$ 0.16	$ 1.62	$ 1.62	$ 0.90	$ 0.33
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount											147,150	985,677
Antidilutive Securities Excluded from Computation of Earnings Per Share, Price Range, Lower Range Limit											$ 21.84	$ 22.57
Antidilutive Securities Excluded from Computation of Earnings Per Share, Price Range, Upper Range Limit											$ 22.57	$ 43.22