Segment Reporting Information - Geographic (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018	Dec. 28, 2018
Geographic Information [Line Items]
Revenues	$ 400,555	$ 415,936	$ 1,233,753	$ 1,246,854
Long-lived Assets	308,656		308,656		$ 229,295
United States
Geographic Information [Line Items]
Revenues	214,468	208,269	638,918	614,592
Long-lived Assets	253,039		253,039		178,331
Other countries
Geographic Information [Line Items]
Revenues	186,087	$ 207,667	594,835	$ 632,262
Long-lived Assets	$ 55,617		$ 55,617		$ 50,964