Revenues - Contract Assets and Liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 27, 2020 USD ($)
Movement in Contract Assets and Liabilities [Roll Forward]
Contract Asset, beginning balance	$ 3,937
Decrease in contract asset	(426)
Contract Asset, ending balance	3,511
Contract liability, beginning balance	4,561
Increase in contract liability	1,234
Contract liability, ending balance	$ 5,795