Goodwill and Other Intangible Assets Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014
Goodwill [Roll Forward]
Goodwill (gross), beginning of period	$ 308,159	$ 317,957
Accumulated Impairment Losses, beginning of period	(79,868)	(79,868)
Goodwill (net), beginning of period	228,291	238,089
Foreign currency translation	(6,629)	(439)
Goodwill (gross), end of period	301,530	317,518
Accumulated Impairment Losses, end of period	(79,868)	(79,868)
Goodwill (net), end of period	$ 221,662	$ 237,650