Restructuring Activities (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 01, 2016	Oct. 01, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	$ 1,903	$ 745
Restructuring Reserve [Roll Forward]
Beginning balance	1,903
Charges	182
Cash Payments	(1,340)
Change in Estimates	0
Ending balance	745
Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	722	5
Restructuring Reserve [Roll Forward]
Beginning balance	722
Charges	49
Cash Payments	(766)
Change in Estimates	0
Ending balance	5
Lease termination
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	1,181	740
Restructuring Reserve [Roll Forward]
Beginning balance	1,181
Charges	133
Cash Payments	(574)
Change in Estimates	0
Ending balance	740
Restructuring Plan, 2015 | 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 | 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 | Structural Systems | Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	600	600
Restructuring Reserve [Roll Forward]
Ending balance	600
Restructuring Plan, 2016 | Severance benefits and loss on early exit from leases
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date		200
Restructuring Plan, 2016 | Electronic Systems | Lease termination
Restructuring Cost and Reserve [Line Items]
Restructuring charges accrued during period	100	$ 100
Restructuring Reserve [Roll Forward]
Ending balance	$ 100