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Restructuring and Other Charges (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Restructuring Cost and Reserve [Line Items]
Beginning balance			$ 12,024
Restructuring and other charges (credits)	$ (186)	$ (172)	(1,188)	$ (2,610)
Cash payments			(10,204)
Effect of foreign currency translation			39
Ending balance	671		671
Employee Severance and Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			11,176
Restructuring and other charges (credits)			(1,200)
Cash payments			(9,829)
Effect of foreign currency translation			30
Ending balance	177		177
Excess Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			848
Restructuring and other charges (credits)			12
Cash payments			(375)
Effect of foreign currency translation			9
Ending balance	$ 494		$ 494