CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 205,274	$ 197,886	$ 644,110	$ 575,959
Cost of sales	168,918	162,747	520,423	465,186
Gross profit	36,356	35,139	123,687	110,773
Selling, product development and administrative expenses	28,909	25,406	94,011	74,755
Operating income	7,447	9,733	29,676	36,018
Pension plan settlement expense	186	0	25,701	0
Interest expense	3,666	1,505	11,025	2,617
Other income, net	(885)	(40)	(1,359)	(93)
Income before income taxes	4,480	8,268	(5,691)	33,494
Income tax expense	1,574	2,076	(5,519)	5,854
Income from equity method investment	(98)	(64)	(120)	(120)
Net income	$ 3,004	$ 6,256	$ (52)	$ 27,760
Earnings per share:
Basic (USD per share)	$ 0.17	$ 0.36	$ 0.00	$ 1.61
Diluted (USD per share)	$ 0.17	$ 0.36	$ 0	$ 1.60
Weighted average number of common shares outstanding:
Basic (shares)	17,270	17,216	17,264	17,189
Diluted (shares)	17,330	17,349	17,264	17,339