Income Taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 24, 2017	Sep. 30, 2018	Sep. 24, 2017
Income Tax Disclosure [Abstract]
Income tax expense	$ 10,092	$ 23,420	$ 25,342	$ 40,873
Effective income tax rate from continuing operations	28.80%	39.10%	26.40%	38.50%