Restructuring and Other Charges (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Restructuring Cost and Reserve [Line Items]
Beginning balance			$ 24,460
Restructuring and other charges, net	$ (55)	$ 101	(2,772)	$ 14,613
Cash payments			(18,273)
Effect of foreign currency translation			239
Ending balance	3,654		3,654
Employee Severance and Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			24,402
Cash payments			(18,111)
Effect of foreign currency translation			242
Ending balance	3,630		3,630
Excess Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			58
Cash payments			(162)
Effect of foreign currency translation			(3)
Ending balance	24		24
2016 restructuring plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net			(2,826)
Ending balance	$ 3,600		3,600
2016 restructuring plan [Member] | Employee Severance and Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net			(2,905)
2016 restructuring plan [Member] | Excess Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net			79
Prior restructuring plans [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net			54
Prior restructuring plans [Member] | Employee Severance and Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net			2
Prior restructuring plans [Member] | Excess Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net			$ 52