Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Income Tax Disclosure [Abstract]
Income tax benefit	$ (23,615)	$ 4,673	$ (23,006)	$ 34,344
Effective income tax rate	(24.90%)	7.40%	(13.10%)	22.50%
Unrecognized tax benefits	$ 36,000		$ 36,000
Unrecognized tax benefits that would impact effective tax rate	$ 25,400		$ 25,400