Restructuring Activities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 02, 2016	Jul. 02, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	$ 1,903	$ 1,112
Restructuring Reserve [Roll Forward]
Beginning balance	1,903
Gross charges	180
Cash payments	(971)
Change in Estimates	0
Ending balance	1,112
Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	722	198
Restructuring Reserve [Roll Forward]
Beginning balance	722
Gross charges	47
Cash payments	(571)
Change in Estimates	0
Ending balance	198
Lease termination
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	1,181	914
Restructuring Reserve [Roll Forward]
Beginning balance	1,181
Gross charges	133
Cash payments	(400)
Change in Estimates	0
Ending balance	914
Restructuring Plan, 2015 [Member] | Severance benefits and loss on early exit from leases
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date		2,200
Restructuring Plan, 2015 [Member] | Electronic Systems | Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	100	100
Restructuring Reserve [Roll Forward]
Ending balance	100
Restructuring Plan, 2015 [Member] | Structural Systems | Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	700	700
Restructuring Reserve [Roll Forward]
Ending balance	700
Restructuring Plan, 2016 [Member] | Severance benefits and loss on early exit from leases
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date		200
Restructuring Plan, 2016 [Member] | Electronic Systems | Lease termination
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	100	$ 100
Restructuring Reserve [Roll Forward]
Ending balance	$ 100