CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Revenues from products and services	$ 73,182	$ 84,229	$ 219,829	$ 254,484
Leasing	9,815	7,066	25,204	23,255
Total revenues	82,997	91,295	245,033	277,739
Cost of sales:
Total cost of sales	62,834	67,211	181,159	205,552
Selling, general and administrative	25,265	20,843	84,416	68,832
Engineering and product development	3,510	3,983	11,270	14,882
Impairments				7,719
Restructuring and other charges		602	26,020	34,902
(Gain) loss on sale of assets	(13)	14	(3,886)	(538)
Foreign currency transaction (gains) and losses	(1,663)	746	(764)	(1,679)
Total costs and expenses	89,933	93,399	298,215	329,670
Operating loss	(6,936)	(2,104)	(53,182)	(51,931)
Interest income	188	188	300	2,047
Interest expense	(94)	(138)	(592)	(538)
Loss before income taxes	(6,842)	(2,054)	(53,474)	(50,422)
Income tax provision (benefit)	4,301	(16,380)	11,094	(30,908)
Net income (loss)	$ (11,143)	$ 14,326	$ (64,568)	$ (19,514)
Income (loss) per common share:
Basic (in dollars per share)	$ (0.31)	$ 0.41	$ (1.82)	$ (0.55)
Diluted (in dollars per share)	$ (0.31)	$ 0.41	$ (1.82)	$ (0.55)
Weighted average common shares outstanding:
Basic (in shares)	35,387	35,049	35,386	35,255
Diluted (in shares)	35,387	35,249	35,386	35,255
Products
Revenues:
Revenues from products and services	$ 53,622	$ 66,451	$ 165,066	$ 197,142
Cost of sales:
Total cost of sales	48,120	50,550	133,243	153,926
Services
Revenues:
Revenues from products and services	19,560	17,778	54,763	57,342
Cost of sales:
Total cost of sales	7,020	9,125	24,687	28,035
Leasing
Cost of sales:
Total cost of sales	$ 7,694	$ 7,536	$ 23,229	$ 23,591