CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Revenues from products and services	$ 86,372	$ 83,910
Leasing	9,626	10,407
Total revenues	95,998	94,317
Cost of sales:
Total cost of sales	71,414	69,376
Selling, general and administrative	21,416	24,544
Engineering and product development	5,525	3,617
Impairments	7,719
Restructuring and other charges	32,713	2,396
Gain on sale of assets	(467)	(13)
Total costs and expenses	138,320	99,920
Operating loss	(42,322)	(5,603)
Interest income	1,206	2,006
Interest expense	(191)	(121)
Loss before income taxes	(41,307)	(3,718)
Income tax provision (benefit)	(21,609)	2,333
Net loss	$ (19,698)	$ (6,051)
Loss per common share:
Basic (in dollars per share)	$ (0.55)	$ (0.17)
Diluted (in dollars per share)	$ (0.55)	$ (0.17)
Weighted average common shares outstanding:
Basic (in shares)	35,695	35,559
Diluted (in shares)	35,695	35,559
Products
Revenues:
Revenues from products and services	$ 67,558	$ 65,434
Cost of sales:
Total cost of sales	53,645	51,544
Services
Revenues:
Revenues from products and services	18,814	18,476
Cost of sales:
Total cost of sales	9,688	9,237
Leasing
Cost of sales:
Total cost of sales	$ 8,081	$ 8,595