Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Income Tax Disclosure [Abstract]
Income tax benefit	$ 609	$ 29,671
Effective income tax rate	0.80%	33.10%
Unrecognized tax benefits	$ 33,900
Unrecognized tax benefits that would impact effective tax rate	$ 25,300