Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jan. 01, 2017
Receivables [Abstract]
Trade receivables	$ 8,863	$ 7,963
Vendor rebates	6,525	7,504
Income taxes receivable	10,960	568
Other accounts receivable	4,673	4,460
Total Accounts Receivable	$ 20,061	$ 19,927