Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 25, 2018
Goodwill [Roll Forward]
Goodwill (gross), beginning of period	$ 258,587	$ 263,698
Accumulated Impairment Losses, beginning of period	(79,868)	(79,868)
Goodwill (net), beginning of period	178,719	183,830
Foreign currency translation	1,220	(1,539)
Goodwill (gross), end of period	259,807	262,159
Accumulated Impairment Losses, ending of period	(79,868)	(79,868)
Goodwill (net), end of period	$ 179,939	$ 182,291