CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Revenues from products and services	$ 287,903	$ 334,411
Total revenues	322,945	364,973	$ 414,806
Cost of sales:
Total cost of sales	242,356	269,698	295,007
Selling, general and administrative	115,036	95,057	98,412
Engineering and product development	15,104	18,920	17,329
Impairments	0	7,719	0
Restructuring and other charges	78,933	35,380	4,396
Gain on sale of assets	(4,482)	(587)	(1,511)
Foreign currency transaction (gains) and losses	836	2,345	(1,630)
Total costs and expenses	447,783	428,532	412,003
Operating income (loss)	(124,838)	(63,559)	2,803
Interest income	575	2,131	7,940
Interest expense	(787)	(621)	(314)
Income (loss) before taxes	(125,050)	(62,049)	10,429
Income tax provision (benefit)	2,946	(31,281)	8,709
Net income (loss)	$ (127,996)	$ (30,768)	$ 1,720
Income (loss) per common share:
Basic (in dollars per share)	$ (3.62)	$ (0.87)	$ 0.05
Diluted (in dollars per share)	$ (3.62)	$ (0.87)	$ 0.05
Weighted average common shares outstanding:
Basic (in shares)	35,331	35,260	35,839
Diluted (in shares)	35,331	35,260	36,152
Products
Revenues:
Revenues from products and services	$ 213,760	$ 258,834	$ 303,279
Cost of sales:
Total cost of sales	178,494	200,758	223,502
Services
Revenues:
Revenues from products and services	74,143	75,577	72,018
Cost of sales:
Total cost of sales	33,173	37,449	36,550
Leasing
Revenues:
Leasing	35,042	30,562	39,509
Cost of sales:
Total cost of sales	$ 30,689	$ 31,491	$ 34,955