Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jul. 03, 2020	Dec. 31, 2019	Jun. 28, 2019	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Accrued compensation and benefits	$ 9,941	$ 15,359
Accrued warranty	5,084	5,756	$ 4,890	$ 4,510
Contract liabilities, current portion	4,235	3,219
Deferred purchase price for acquisitions	22,535	27,735
Finance lease obligations	9,263	1,307
Other	17,073	16,950
Total	$ 68,131	$ 70,326