Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2017	Dec. 28, 2016	Dec. 30, 2015
Supplemental Cash Flow Information [Abstract]
Income taxes paid, net	$ 6,367	$ 3,012	$ 5,364
Interest paid	14,636	11,288	8,141
Noncash investing and financing activities:
Notes received in connection with disposition of property	1,750	0	0
Property acquisition payable	500	0	573
Accrued purchase of property	531	1,445	1,781
Insurance proceeds receivable	364	0	0
Issuance of common stock, pursuant to share-based compensation plans	4,961	3,597	4,551
Execution of capital leases	6,573	9,597	5,556
Treasury stock payable	$ 120	$ 313	$ 185