Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Dec. 31, 2017
Income Taxes [Abstract]
Increase in liabilities for unrecognized tax benefits	$ 568
TCJA income tax expense Abstract [Abstract]
TCJA tax on unremitted foreign earnings			$ 215,558
TCJA foreign taxes on assumed repatriation			213,000
Expected TCJA tax payment, net	180,000
Additional expected repatriation			$ 1,100,000
Cash repatriated during the current period	0
Remeasurement of repatriation deferred tax liability [Member]
Effect on Income Tax Expense (Benefit) [Line Items]
Deferred Other Tax Expense (Benefit)	$ 1,316	$ (968)