Income Taxes - Income Tax Expense (Benefit) and Effective Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Income Tax Disclosure [Abstract]
Income tax benefit	$ (2,244)	$ (4,247)	$ (4,045)	$ (2,803)
Effective income tax rate	(8.30%)	28.50%	(10.70%)	29.00%