Marketable Securities - Schedule of Marketable Securities by Category (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 190,887	$ 189,309
Gross Unrealized Holding Gains	318	260
Gross Unrealized Holding Losses	576	6
Fair Value	190,629	189,563
Municipal notes and bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	70,499	80,926
Gross Unrealized Holding Gains	296	188
Gross Unrealized Holding Losses	10	6
Fair Value	70,785	81,108
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,216	10,767
Gross Unrealized Holding Gains	2	12
Gross Unrealized Holding Losses	59
Fair Value	12,159	10,779
Certificates of deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	33,154	30,500
Gross Unrealized Holding Gains	13	7
Gross Unrealized Holding Losses	262
Fair Value	32,905	30,507
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	42,511	30,707
Gross Unrealized Holding Gains	1	1
Gross Unrealized Holding Losses	66
Fair Value	42,446	30,708
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	32,507	36,409
Gross Unrealized Holding Gains	6	52
Gross Unrealized Holding Losses	179
Fair Value	$ 32,334	$ 36,461