Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 31, 2017
Income Taxes [Abstract]
Increase in liabilities for unrecognized tax benefits			$ 288
TCJA income tax expense Abstract [Abstract]
TCJA tax on unremitted foreign earnings					$ 215,558
TCJA foreign taxes on assumed repatriation	$ 12,000				213,000
Expected TCJA tax payment, net	180,000		180,000
Additional expected repatriation	1,200,000				$ 1,100,000
Cash repatriated during the current period	274,000
Repatriation taxes paid	92,100
TCJA transition taxes paid	14,400
Future cash repatriation [Abstract]
Future cash repatriation next fiscal quarter	450,000		450,000
Future cash repatriation following next fiscal quarter	300,000		300,000
Taxes associated with future cash repatriation next fiscal quarter	72,000		72,000
Remeasurement of repatriation deferred tax liability [Member]
Effect on Income Tax Expense (Benefit) [Line Items]
Deferred Other Tax Expense (Benefit)	(9,006)	$ (1,240)	$ (7,690)	$ (2,208)
Remeasurement of deferred tax liability debt extinguishment [Member]
Effect on Income Tax Expense (Benefit) [Line Items]
Deferred Other Tax Expense (Benefit)	$ (33,963)