Information on Business Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Segment	Jun. 30, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			2
Net sales	$ 314,941	$ 322,074	$ 615,515	$ 634,173
Operating profit	50,649	45,381	94,544	80,506
Interest expense	2,586	2,804	5,306	6,123
Other expense (income), net	237	792	318	1,027
Income before income taxes	47,826	41,785	88,920	73,356
Aerospace [Member]
Segment Reporting Information [Line Items]
Net sales	112,356	109,310	212,581	217,521
Operating profit	20,670	16,616	33,586	32,366
Industrial [Member]
Segment Reporting Information [Line Items]
Net sales	202,589	212,768	402,938	416,656
Operating profit	29,979	28,765	60,958	48,140
Intersegment sales [Member]
Segment Reporting Information [Line Items]
Net sales	$ (4)	$ (4)	$ (4)	$ (4)