Acquisitions (Details) - USD ($)	1 Months Ended		9 Months Ended
	Apr. 30, 2017	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Business Acquisition [Line Items]
Business acquisition			$ 10,500,000	$ 0
Goodwill		$ 86,600,000	92,000,000
Aero-Missile Components Inc
Business Acquisition [Line Items]
Business acquisition	$ 10,500,000
Goodwill			2,100,000
GH Electrotermia S.A.
Business Acquisition [Line Items]
Business acquisition		23,400,000
Cash acquired		6,300,000
Deb assumed in acquisition		13,900,000
Contingent consideration, fair value of earn-out (up to)		$ 2,100,000.0
Estimated fair value of the earn-out			$ 400,000