Information on Business Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) Segment	Jun. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			2
Net sales	$ 235,537	$ 371,669	$ 566,207	$ 748,360
Operating profit (loss)	10,115	56,957	59,429	107,607
Interest expense	3,898	5,399	8,223	10,512
Other expense (income), net	1,060	1,712	2,654	3,519
Income before income taxes	5,157	49,846	48,552	93,576
Industrial
Segment Reporting Information [Line Items]
Net sales	165,029	233,404	364,128	475,906
Aerospace
Segment Reporting Information [Line Items]
Net sales	70,508	138,265	202,079	272,454
Operating Segments | Industrial
Segment Reporting Information [Line Items]
Net sales	165,031	233,404	364,131	475,906
Operating profit (loss)	(300)	27,430	17,625	48,931
Operating Segments | Aerospace
Segment Reporting Information [Line Items]
Net sales	70,508	138,265	202,079	272,454
Operating profit (loss)	10,415	29,527	41,804	58,676
Intersegment sales
Segment Reporting Information [Line Items]
Net sales	$ (2)	$ 0	$ (3)	$ 0