Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 03, 2016	Jun. 28, 2015
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 145,607	$ 170,773
Goodwill additions	108,002	4,100
Goodwill, Translation and Purchase Accounting Adjustments	3,672	(6,937)
Goodwill, end of period	$ 257,281	$ 167,936