Marketable Securities - Schedule of Marketable Securities by Category (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 182,135	$ 189,309
Gross Unrealized Holding Gains	561	260
Gross Unrealized Holding Losses	23	6
Fair Value	182,673	189,563
Municipal notes and bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	64,366	80,926
Gross Unrealized Holding Gains	235	188
Gross Unrealized Holding Losses	2	6
Fair Value	64,599	81,108
U.S. treasury securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,996
Fair Value	4,996
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,479	10,767
Gross Unrealized Holding Gains	78	12
Fair Value	15,557	10,779
Certificates of deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	35,798	30,500
Gross Unrealized Holding Gains	18	7
Gross Unrealized Holding Losses	17
Fair Value	35,799	30,507
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	26,474	30,707
Gross Unrealized Holding Gains	19	1
Gross Unrealized Holding Losses	2
Fair Value	26,491	30,708
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	35,022	36,409
Gross Unrealized Holding Gains	211	52
Gross Unrealized Holding Losses	2
Fair Value	$ 35,231	$ 36,461