Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Jun. 28, 2020	Sep. 27, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Amount computed at statutory federal income tax rate						$ 6,358	$ (12,452)	$ (7,471)
Increases (decreases) in tax resulting from:
CARES Act adjustment						(2,435)	0	0
Section 250 Deduction						(2,834)	(2,682)	(743)
Non taxable income						(2,868)	(1,071)	(1,049)
Non deductible compensation						1,735	0	0
Change in valuation allowance						4,180	5,601	7,026
Effect of foreign operations						87	135	505
Change in Uncertain tax position						2,272	237	553
Minority Interest						748	552	(29)
Transaction costs						(865)	0	0
Warrants fair value adjustment						(3,388)	0	0
Other permanent differences, net						(722)	549	(1,453)
Provision for income taxes	$ 4,194	$ 3,752	$ (9,529)	$ (5,776)	$ (1,582)	$ 2,268	$ (9,131)	$ (2,661)