CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues:
Revenues from products and services	$ 320,037	$ 287,903	$ 334,411
Total revenues	362,070	322,945	364,973
Cost of sales:
Total cost of sales	265,935	242,356	269,698
Selling, general and administrative	94,206	115,036	95,057
Engineering and product development	11,740	15,104	18,920
Impairments	0	0	7,719
Restructuring and other charges	11,443	78,933	35,380
Gain on sale of property, plant and equipment	(20,019)	(4,482)	(587)
Foreign currency transaction (gain) loss	(3,756)	836	2,345
Total costs and expenses	359,549	447,783	428,532
Operating income (loss)	2,521	(124,838)	(63,559)
Interest income	4,465	575	2,131
Interest expense	(216)	(787)	(621)
Income (loss) before income taxes	6,770	(125,050)	(62,049)
Income tax provision (benefit)	6,327	2,946	(31,281)
Net income (loss)	$ 443	$ (127,996)	$ (30,768)
Income (loss) per common share:
Basic	$ 0.01	$ (3.62)	$ (0.87)
Diluted	$ 0.01	$ (3.62)	$ (0.87)
Weighted average common shares outstanding:
Basic	34,237	35,331	35,260
Diluted	34,467	35,331	35,260
Products
Revenues:
Revenues from products and services	$ 240,842	$ 213,760	$ 258,834
Cost of sales:
Total cost of sales	203,759	178,494	200,758
Services
Revenues:
Revenues from products and services	79,195	74,143	75,577
Cost of sales:
Total cost of sales	32,046	33,173	37,449
Leasing
Revenues:
Leasing	42,033	35,042	30,562
Cost of sales:
Total cost of sales	$ 30,130	$ 30,689	$ 31,491