Supplemental Disclosures to Condensed Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jul. 02, 2019
Supplemental Cash Flow Elements [Abstract]
Interest paid (net of amounts capitalized)	$ 1,666	$ 1,382
Income taxes paid	25	6
Purchases of property and equipment accrued in accounts payable	$ 1,793	$ 2,392