Information on Business Segments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) Segment	Mar. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	2
Net sales	$ 288,332	$ 300,573
Operating profit	41,527	43,895
Interest expense	2,991	2,720
Other expense (income), net	227	81
Income before income taxes	38,309	41,094
Aerospace [Member]
Segment Reporting Information [Line Items]
Net sales	93,087	100,224
Operating profit	11,883	12,916
Industrial [Member]
Segment Reporting Information [Line Items]
Net sales	195,246	200,349
Operating profit	29,644	30,979
Intersegment sales [Member]
Segment Reporting Information [Line Items]
Net sales	$ (1)	$ 0