Segment Reporting Information - Geographic (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018	Dec. 28, 2018
Geographic Information [Line Items]
Revenues	$ 428,328	$ 424,570	$ 833,198	$ 830,918
Long-lived Assets	286,521		286,521		$ 229,295
United States
Geographic Information [Line Items]
Revenues	221,565	212,541	424,450	406,323
Long-lived Assets	229,398		229,398		178,331
Other countries
Geographic Information [Line Items]
Revenues	206,763	$ 212,029	408,748	$ 424,595
Long-lived Assets	$ 57,123		$ 57,123		$ 50,964