Information on Business Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) Segment	Jun. 30, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			2
Net sales	$ 364,493	$ 306,693	$ 706,295	$ 595,025
Operating profit	57,140	47,460	112,887	88,987
Interest expense	3,541	2,815	6,890	5,806
Other expense (income), net	394	(824)	416	(597)
Income before income taxes	53,205	45,469	105,581	83,778
Aerospace [Member]
Segment Reporting Information [Line Items]
Net sales	112,662	102,153	227,132	195,240
Operating profit	19,745	12,617	42,037	24,500
Industrial [Member]
Segment Reporting Information [Line Items]
Net sales	251,845	204,540	479,185	399,786
Operating profit	37,395	34,843	70,850	64,487
Intersegment sales [Member]
Segment Reporting Information [Line Items]
Net sales	$ (14)	$ 0	$ (22)	$ (1)