Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ 120	$ 28,091	$ 1,292
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance as of December 31, 2016		(76,262)
Balance as of October 1, 2017		(48,170)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		9,510
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance as of December 31, 2016		(62,703)
Balance as of October 1, 2017		(34,612)
Pension, net
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance as of December 31, 2016		(13,558)
Other comprehensive income, net of tax		0
Balance as of October 1, 2017		$ (13,558)