Information on Business Segments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Segment	Mar. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	2
Net sales	$ 376,692	$ 366,660
Operating profit	50,649	56,633
Interest expense	5,113	3,892
Other expense (income), net	1,806	1,763
Income before income taxes	43,730	50,978
Aerospace [Member]
Segment Reporting Information [Line Items]
Net sales	134,190	120,699
Operating profit	29,147	24,255
Industrial [Member]
Segment Reporting Information [Line Items]
Net sales	242,502	245,967
Operating profit	21,502	32,378
Intersegment sales [Member]
Segment Reporting Information [Line Items]
Net sales	$ 0	$ (6)