CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Revenues from products and services	$ 73,250	$ 86,372
Leasing	7,989	9,626
Total revenues	81,239	95,998
Cost of sales:
Total cost of sales	56,787	71,414
Selling, general and administrative	29,558	24,658
Engineering and product development	4,037	5,525
Impairments		7,719
Restructuring and other charges	25,020	32,713
Gain on sale of assets	(3,955)	(467)
Foreign currency transaction (gains) and losses	1,374	(3,242)
Total costs and expenses	112,821	138,320
Operating loss	(31,582)	(42,322)
Interest income	49	1,206
Interest expense	(439)	(191)
Loss before income taxes	(31,972)	(41,307)
Income tax provision (benefit)	2,386	(21,609)
Net loss	$ (34,358)	$ (19,698)
Loss per common share:
Basic (in dollars per share)	$ (0.97)	$ (0.55)
Diluted (in dollars per share)	$ (0.97)	$ (0.55)
Weighted average common shares outstanding:
Basic (in shares)	35,385	35,695
Diluted (in shares)	35,385	35,695
Products
Revenues:
Revenues from products and services	$ 55,583	$ 67,558
Cost of sales:
Total cost of sales	41,204	53,645
Services
Revenues:
Revenues from products and services	17,667	18,814
Cost of sales:
Total cost of sales	9,350	9,688
Leasing
Cost of sales:
Total cost of sales	$ 6,233	$ 8,081