Valuation and Qualifying Accounts - Schedule of Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance For Doubtful Accounts [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 1,247	$ 691	$ 460
Charged to (Recovery of) Costs and Expense	327	363	293
Deductions	790	(193)	62
Balance at End of Period	784	1,247	691
Deferred Tax Valuation Allowance [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	14,160	3,172	2,447
Charged to (Recovery of) Costs and Expense	78	942	725
Charged to Other Accounts (net)		10,046
Balance at End of Period	14,238	14,160	$ 3,172
Allowance for Convertible Notes Receivable [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	2,000
Charged to (Recovery of) Costs and Expense		2,000
Deductions	$ 2,000
Balance at End of Period		$ 2,000