Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2020	Sep. 27, 2019	Sep. 25, 2020	Sep. 27, 2019
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ (4,595)	$ 12,260	$ (39,643)	$ (10,513)
Provision for income taxes	$ 786	$ 603	$ 3,093	$ 981
Effective income tax rate	(17.10%)	4.90%	(7.80%)	(9.30%)