Information on Business Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013 Segment	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Number of reportable segments (in segments)		2
Net sales	$ 267,394		$ 215,310	$ 530,940	$ 438,104
Operating profit	36,149		25,760	61,105	50,378
Interest expense	3,241		2,435	7,598	4,803
Other expense (income), net	495		55	1,462	914
Total before tax	32,413		23,270	52,045	44,661
Aerospace [Member]
Segment Reporting Information [Line Items]
Net sales	96,834		93,770	194,878	191,020
Operating profit	15,226		13,023	25,573	25,677
Industrial [Member]
Segment Reporting Information [Line Items]
Net sales	170,560		121,540	336,062	247,085
Operating profit	20,923		12,737	35,532	24,701
Intersegment sales [Member]
Segment Reporting Information [Line Items]
Net sales	$ 0		$ 0	$ 0	$ (1)