Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income tax benefit	$ 1,310	$ (609)
Effective income tax rate	(1.70%)	0.80%
Unrecognized tax benefits	$ 48,600
Unrecognized tax benefits that would impact effective tax rate	$ 25,000