Supplemental Disclosures to Condensed Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 02, 2019	Jul. 03, 2018
Class of Stock [Line Items]
Interest paid (net of amounts capitalized)	$ 1,382	$ 1,973
Income taxes paid	6	49
Changes in purchases of property and equipment accrued in accounts payable, net	$ (1,054)	$ 1,580