Restructuring Activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 02, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	$ 1,903	$ 1,460
Restructuring Reserve [Roll Forward]
Beginning balance	1,903
Gross charges	22
Cash payments	(465)
Change in Estimates	0
Ending balance	1,460
Severance benefits and loss on early exit from leases
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date		2,200
Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	722	409
Restructuring Reserve [Roll Forward]
Beginning balance	722
Gross charges	22
Cash payments	(335)
Change in Estimates	0
Ending balance	409
Lease termination
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	1,181	1,051
Restructuring Reserve [Roll Forward]
Beginning balance	1,181
Gross charges	0
Cash payments	(130)
Change in Estimates	0
Ending balance	1,051
Electronic Systems | Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	500	500
Restructuring Reserve [Roll Forward]
Ending balance	500
Structural Systems | Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	1,000	$ 1,000
Restructuring Reserve [Roll Forward]
Ending balance	$ 1,000