Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss, balance at the beginning of the period			$ (216,280)
Other comprehensive income (loss), net of tax	$ 27,348	$ 1,525	95,853	$ (8,678)
Accumulated other comprehensive loss, balance at the end of the period	(120,427)		(120,427)
Currency Translation Adjustment
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss, balance at the beginning of the period			(170,566)
Other comprehensive income (loss), net of tax			94,209
Accumulated other comprehensive loss, balance at the end of the period	(76,357)		(76,357)
Unrealized Gain (Loss) on Retirement Plans
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss, balance at the beginning of the period			(43,894)
Other comprehensive income (loss), net of tax			52
Accumulated other comprehensive loss, balance at the end of the period	(43,842)		(43,842)
Unrealized Gain (Loss) on Investments
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss, balance at the beginning of the period			(1,820)
Other comprehensive income (loss), net of tax			1,592
Accumulated other comprehensive loss, balance at the end of the period	$ (228)		$ (228)