Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Total revenues	$ 815,594	$ 614,781	$ 492,625
Cost of revenues
Total cost of revenues	694,058	529,552	473,258
Selling, general and administrative expenses	97,618	94,445	86,604
Other operating (income) loss, net	(4,370)	(391)	(3,330)
Impairments and other charges	37,322	0	14,727
Operating loss	(9,034)	(8,825)	(78,634)
Foreign currency exchange (gain) loss	389	(397)	3,378
Interest expense, net	7,040	8,805	10,986
(Gain) loss on extinguishment of debt	0	1,000	(419)
Loss before income taxes	(16,463)	(18,233)	(92,579)
Provision (benefit) for income taxes	4,371	7,293	(11,883)
Net loss	$ (20,834)	$ (25,526)	$ (80,696)
Net loss per common share - basic (in dollars per share)	$ (0.22)	$ (0.28)	$ (0.89)
Net loss per common share - diluted (in dollars per share)	$ (0.22)	$ (0.28)	$ (0.89)
Product sales revenues
Revenues
Total revenues	$ 665,318	$ 484,300	$ 378,813
Cost of revenues
Total cost of revenues	588,234	434,405	384,519
Rental and service revenues
Revenues
Total revenues	150,276	130,481	113,812
Cost of revenues
Total cost of revenues	$ 105,824	$ 95,147	$ 88,739