CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 73,564	$ 100,135
Cost of products sold	49,094	63,730
Gross profit	24,470	36,405
Costs and expenses:
General and administrative expenses	8,126	9,168
Selling and distribution expenses	8,527	6,309
Amortization of purchased intangible assets	354	398
Restructuring expenses, net and asset impairments	1,116	78
Total costs and expenses	18,123	15,953
Operating income	6,347	20,452
Other income (expense):
Other income (expense), net	115	(21)
Interest expense, net	(238)	(373)
Income before income taxes	6,224	20,058
Income tax provision	2,069	4,888
Net income	$ 4,155	$ 15,170
Net income per share
Basic (in dollars per share)	$ 0.28	$ 1.02
Diluted (in dollars per share)	$ 0.28	$ 1.01
Weighted average shares outstanding:
Basic (in shares)	14,697,164	14,606,052
Diluted (in shares)	14,717,836	14,671,689
Dividends declared per common share (in dollars per share)	$ 0.125	$ 0.02