Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2017	Apr. 03, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		$ 8,294
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance as of December 31, 2016	$ (76,262)
Other comprehensive income, net of tax	5,396
Balance as of April 2, 2017	(70,865)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	5,396
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance as of December 31, 2016	(62,703)
Balance as of April 2, 2017	(57,307)
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 April 2, 2017	$ (13,558)