Information on Business Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) Segment	Sep. 30, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			2
Net sales	$ 357,156	$ 311,561	$ 1,063,451	$ 906,586
Operating profit	47,786	51,817	160,673	140,804
Interest expense	3,748	3,020	10,638	8,826
Other expense (income), net	357	621	773	24
Income before income taxes	43,681	48,176	149,262	131,954
Aerospace [Member]
Segment Reporting Information [Line Items]
Net sales	116,767	102,816	343,899	298,055
Operating profit	18,478	16,859	60,519	41,359
Industrial [Member]
Segment Reporting Information [Line Items]
Net sales	240,390	208,748	719,556	608,534
Operating profit	29,308	34,958	100,154	99,445
Intersegment sales [Member]
Segment Reporting Information [Line Items]
Net sales	$ (1)	$ (3)	$ (4)	$ (3)