CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 200,527	$ 218,025
Cost of sales	161,959	175,969
Gross profit	38,568	42,056
Selling, product development and administrative expenses	33,027	33,006
Impairment of goodwill and other long-lived assets	61,109	0
Operating (loss) income	(55,568)	9,050
Employee benefit plans settlement expenses	385	0
Interest expense	2,857	3,628
Other (income) expense, net	(418)	399
(Loss) income before income taxes	(58,392)	5,023
Income tax (benefit) expense	(2,015)	1,106
Loss from equity method investment	44	27
Net (loss) income	$ (56,421)	$ 3,890
(Loss) earnings per share:
Basic (USD per share)	$ (3.25)	$ 0.23
Diluted (USD per share)	$ (3.25)	$ 0.22
Weighted average number of common shares outstanding:
Basic (shares)	17,336	17,254
Diluted (shares)	17,336	17,318