Information on Business Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Segment	Sep. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			2
Net sales	$ 269,059	$ 372,587	$ 835,266	$ 1,120,947
Operating profit	31,243	67,585	90,672	175,192
Interest expense	3,701	5,344	11,924	15,856
Other expense (income), net	47	2,524	2,700	6,043
Income before income taxes	27,495	59,717	76,048	153,293
Industrial
Segment Reporting Information [Line Items]
Net sales	196,911	231,688	561,039	707,594
Aerospace
Segment Reporting Information [Line Items]
Net sales	72,148	140,899	274,227	413,353
Operating Segments | Industrial
Segment Reporting Information [Line Items]
Net sales	196,916	231,688	561,047	707,594
Operating profit	24,438	34,836	42,063	83,785
Operating Segments | Aerospace
Segment Reporting Information [Line Items]
Net sales	72,148	140,899	274,227	413,353
Operating profit	6,805	32,749	48,609	91,407
Intersegment sales
Segment Reporting Information [Line Items]
Net sales	$ (5)	$ 0	$ (8)	$ 0