Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Gross Sales	$ 184,822	$ 192,136
Revenues and other items:
Other income (expense), net	760	(26,130)
Total revenues, net of other expenses	185,582	166,006
Costs and expenses:
Selling, general and administrative	18,384	20,044
Research and development	1,721	2,170
Amortization of identifiable intangibles	723	758
Accrued pension and post-retirement benefits	3,540	3,567
Interest expense	822	555
Asset impairments and costs associated with exit and disposal activities, net of adjustments	169	61
Goodwill, Impairment Loss	0	13,696
Total	172,867	192,895
Income (loss) from continuing operations before income taxes	12,715	(26,889)
Income taxes from continuing operations	3,097	(6,226)
Net income (loss) from continuing operations	9,618	(20,663)
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	(587)	(1,658)
Net income (loss)	$ 9,031	$ (22,321)
Basic:
Continuing operations	$ 0.29	$ (0.62)
Discontinued operations	(0.02)	(0.05)
Basic earnings (loss) per share	0.27	(0.67)
Diluted:
Continuing operations	0.29	(0.62)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	(0.02)	(0.05)
Diluted earnings (loss) per share	$ 0.27	$ (0.67)
Shares used to compute earnings (loss) per share:
Basic	33,406	33,313
Diluted	33,644	33,313
Product [Member]
Costs and expenses:
Cost of goods sold	$ 141,285	$ 145,169
Shipping and Handling [Member]
Costs and expenses:
Cost of goods sold	$ 6,223	$ 6,875