CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Revenues from products and services	$ 84,229	$ 99,735	$ 254,484	$ 277,454
Leasing	7,066	8,492	23,255	28,899
Total revenues	91,295	108,227	277,739	306,353
Cost of sales:
Total cost of sales	67,211	76,023	205,552	219,271
Selling, general and administrative	20,843	29,105	68,832	77,411
Engineering and product development	3,983	3,754	14,882	12,531
Impairments			7,719
Restructuring and other charges	602	546	34,902	3,961
(Gain) loss on sale of assets	14	(280)	(538)	(1,483)
Foreign currency transaction (gains) and losses	746	(1,143)	(1,679)	(2,079)
Total costs and expenses	93,399	108,005	329,670	309,612
Operating income (loss)	(2,104)	222	(51,931)	(3,259)
Interest income	188	1,906	2,047	6,592
Interest expense	(138)	(26)	(538)	(148)
Income (loss) before income taxes	(2,054)	2,102	(50,422)	3,185
Income tax provision (benefit)	(16,380)	3,412	(30,908)	8,864
Net income (loss)	$ 14,326	$ (1,310)	$ (19,514)	$ (5,679)
Income (loss) per common share:
Basic (in dollars per share)	$ 0.41	$ (0.04)	$ (0.55)	$ (0.16)
Diluted (in dollars per share)	$ 0.41	$ (0.04)	$ (0.55)	$ (0.16)
Weighted average common shares outstanding:
Basic (in shares)	35,049	35,559	35,255	35,827
Diluted (in shares)	35,249	35,559	35,255	35,827
Products
Revenues:
Revenues from products and services	$ 66,451	$ 81,851	$ 197,142	$ 224,518
Cost of sales:
Total cost of sales	50,550	58,632	153,926	163,750
Services
Revenues:
Revenues from products and services	17,778	17,884	57,342	52,936
Cost of sales:
Total cost of sales	9,125	8,451	28,035	27,906
Leasing
Cost of sales:
Total cost of sales	$ 7,536	$ 8,940	$ 23,591	$ 27,615