Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jun. 27, 2015	Jul. 02, 2016	Jun. 27, 2015
Restructuring Reserve [Roll Forward]
Restructuring costs	$ 1,011	$ 304	$ 1,686	$ 382
Employee Severance
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			2,827
Restructuring costs	1,000	$ 300	1,686	$ 400
Paid restructuring costs			(3,351)
Translation adjustment			1
Restructuring reserve, ending balance	$ 1,163		$ 1,163